Đề kiểm tra định kì môn tiếng anh lớp 10 trường THPT liễn sơn, vĩnh phúc

VINH PHUC
EDUCATION & TRAINING SERVICE
Lien Son High School

WRITTEN test
Time allowance: 45 minutes

Nội dung đề số 531
I. Choose the option among A, B, C, or D provided the best one to complete each of the following incomplete sentences.
01. I was surprised at ____.
A. how it was cold B. how cold it was C. how cold was it D. how was it cold
02. ____ isn’t obvious.
A. Which route would be best B. The best route should be
C. The best route would be D. That route would be best
03. Tam looked as if ____.
A. he had seen a ghost B. a ghost did he see C. a ghost he had seen D. he has seen a ghost
04. We would go out if ____.
A. we are free B. it were sunny C. it will be sunny D. we will have time
05. ____, people start shouting and cheering for one side or the other.
A. if the game begin B. soon the game begins C. beginning the game D. as soon as the game begins
II. Choose the option among A, B, C, or D provided the one whose stress pattern is different from others.
06. A. appear B. damage C. refund D. entire
07. A. photograph B. incentive C. advantage D. impression
III. Choose the option among A, B, C, or D provided the one that needs correcting to make the sentences right.
08. As soon as he saw what she did, he told the bus driver to stop.
A. to stop B. saw C. did D. as
09. Most of viewers are children and it is them who are exposed to violence.
A. them B. to C. Most D. children
10. I was sure that she had recognized me and so I must talk to her.
A. and so B. that C. must D. to
11. When she arrives, she will be wearing a blue jeans so that you can recognize her.

A. be B. When C. so D. a
12. There was little point to take the car back to the same garage.
A. to take B. car back C. little D. same
IV. Choose the option among A, B, C, or D provided the best one to complete each of the following gaps of the incomplete
passage.
Yesterday was a bad day for Albert. (13) ____ seemed to go right for him. First of all, he woke up late for school.
That was unusual for Albert because he always sets his alarm clock for 6:30 before going to bed at night and have always (14)
____ up as soon as the alarm goes off in the morning but this morning Albert didn’t even hear the alarm. In fact, he probably
(15) ____ up until eight o’clock or even later if his mother hadn’t got up to see if Albert had left for school yet. She was
surprised to find him still in bed and shook him hard until he got out of bed. When Albert finally (16) ____ school, the
second lesson had already begun and the class was having a test. As soon as Albert took his seat and looked at the test paper,
he wished that he (17) ____ to school after that. He couldn’t answer even one question on the test paper as he had completely
forgotten to study for the test the night before.
13. A. Most things B. Something C. Nothing D. Everything
14. A. got B. gets C. has got D. is getting
15. A. won’t wake B. won’t have woken C. didn’t wake D. wouldn’t have woken
16. A. reached B. arrived C. went D. got
17. A. wouldn’t go B. won’t go C. hadn’t gone D. didn’t go
V. Choose the option among A, B, C, or D provided the best one to complete each of the following incomplete sentences.
18. My uncle's office is on ____.
A. the third floor B. third floor C. floor three D. three's floor
19. When the police arrived, all the money in the bank had ____.
A. run B. stolen C. disappeared D. lost
20. If the machine is not properly operated, it may ____ down.
A. broken B. break C. breaking D. broke
21. He drove so carelessly that he was sure to ____ an accident.
A. meet B. cause C. see D. make
22. The men here are very handsome, but I ____ you. Please come!
A. miss B. look C. see D. remember
23. All the men but one ____ present last night.

A. were B. are C. was D. is
24. It is my great ____ to meet you here.
A. please B. pleased C. pleasure D. pleasing
25. This is the book that I want you to read ____.
A. through B. across C. all D. quick
26. There are so many people in the street that the police couldn't do ____.
A. nothing B. most things C. everything D. anything
27. Harry Potter has been____ in the U.S and many other countries around the world.
A. showing B. showed C. shown D. show
28. This is my ex-wife. We got ____ two years ago.
A. divorced B. divorces C. divorce D. divorcing
29. Look at the crowd. I ____ what they are waiting for.
A. see B. interested C. wonder D. don't know
30. Peter goes to the window and ____ down. There's a Mercedes waiting for him.
A. turns B. views C. looks D. sees
31. When she left school last year, she went ____ into the drama college.
A. straight B. rightly C. right D. straightly
32. A sudden noise from the streets ____ me out of my dream.
A. brought B. made C. called D. drove
VI. Choose the option among A, B, C, or D provided the one whose underlined part pronounced differently from others.
33. A. shall B. tall C. ball D. hall
34. A. bound B. sound C. country D. count
35. A. irrigation B. major C. stacks D. wastes
VII. Read the text carefully then choose the option among A, B, C, or D provided the best one to complete each of the
following questions.
Is your life full of stress? Maybe it is your astrological sign. A study in Australia last year said signs with the most
stress are Aquarius (Jan 20 to Feb 18), Gemini (May 21 to June 20) Virgo (Aug 23 to Sept 22) and Cancer (June 21 to July
22). The people who have peaceful lives are under the signs of Pisces (Feb 21 to March 20) , Scorpio (Oct 23 to Nov 22, and
Taurus (April 21 to May 20). Kathleen Johnson, a Vermont astrologer, decided to continue the work. . She now has a stress
chart that decides which marriages and friendships will be most harmonious and which will be most stressed. Johnson says

that any sign together with Pisces or Scorpio will probably have an easy and peaceful time. But signs that are put together
with Aquarius would always be stressed. And marriage of Aquarius to Aquarius have no possibility of success. Says Johnson,
"We should all work together. If I know something as an astrologer that would help you as a doctor or psychotherapist, why
not?"
36. Johnson believes that Taurus is a ____ sign.
A. easy B. unhappy C. peaceful D. stressed
37. What is the most important idea in this text?
A. We should all work together. B. Your astrological sign can be important in a friendship.
C. It will help your marriage if you study astrology. D. You should by an astrology book to read.
38. A Scorpio who marries a Pisces will be ____.
A. peaceful B. stressed C. happy D. unsuccessful.
39. Some friendships are more ____ than others.
A. decided B. religious C. harmonious D. astrological
40. According to Johnson Aquarius is a ____ sign.
A. stressed B. friendly C. happy D. peaceful
THE END
VINH PHUC
EDUCATION & TRAINING SERVICE
Lien Son High School

WRITTEN test
Time allowance: 45 minutes


Nội dung đề số 542
I. Choose the option among A, B, C, or D provided the best one to complete each of the following incomplete sentences.
01. My uncle's office is on ____.
A. three's floor B. floor three C. the third floor D. third floor
02. He drove so carelessly that he was sure to ____ an accident.
A. cause B. meet C. see D. make

03. A sudden noise from the streets ____ me out of my dream.
A. brought B. made C. called D. drove
04. Harry Potter has been____ in the U.S and many other countries around the world.
A. show B. shown C. showed D. showing
05. There are so many people in the street that the police couldn't do ____.
A. nothing B. anything C. everything D. most things
06. All the men but one ____ present last night.
A. are B. were C. was D. is
07. Look at the crowd. I ____ what they are waiting for.
A. interested B. see C. wonder D. don't know
08. It is my great ____ to meet you here.
A. pleasing B. pleasure C. please D. pleased
09. This is the book that I want you to read ____.
A. through B. across C. all D. quick
10. When the police arrived, all the money in the bank had ____.
A. stolen B. run C. lost D. disappeared
11. When she left school last year, she went ____ into the drama college.
A. straight B. right C. straightly D. rightly
12. If the machine is not properly operated, it may ____ down.
A. break B. broken C. breaking D. broke
13. This is my ex-wife. We got ____ two years ago.
A. divorcing B. divorced C. divorces D. divorce
14. The men here are very handsome, but I ____ you. Please come!
A. remember B. look C. see D. miss
15. Peter goes to the window and ____ down. There's a Mercedes waiting for him.
A. looks B. sees C. turns D. views
II. Choose the option among A, B, C, or D provided the best one to complete each of the following incomplete sentences.
16. I was surprised at ____.
A. how it was cold B. how was it cold C. how cold it was D. how cold was it
17. ____, people start shouting and cheering for one side or the other.

A. soon the game begins B. if the game begin C. beginning the game D. as soon as the game begins
18. We would go out if ____.
A. we are free B. it were sunny C. it will be sunny D. we will have time
19. ____ isn’t obvious.
A. The best route should be B. That route would be best
C. The best route would be D. Which route would be best
20. Tam looked as if ____.
A. a ghost he had seen B. he had seen a ghost C. he has seen a ghost D. a ghost did he see
III. Choose the option among A, B, C, or D provided the one that needs correcting to make the sentences right.
21. There was little point to take the car back to the same garage.
A. to take B. same C. little D. car back
22. I was sure that she had recognized me and so I must talk to her.
A. that B. and so C. must D. to
23. When she arrives, she will be wearing a blue jeans so that you can recognize her.
A. be B. a C. so D. When
24. As soon as he saw what she did, he told the bus driver to stop.
A. to stop B. as C. did D. saw
25. Most of viewers are children and it is them who are exposed to violence.
A. them B. to C. children D. Most
IV. Choose the option among A, B, C, or D provided the best one to complete each of the following gaps of the incomplete
passage.
Yesterday was a bad day for Albert. (26) ____ seemed to go right for him. First of all, he woke up late for school.
That was unusual for Albert because he always sets his alarm clock for 6:30 before going to bed at night and have always (27)
____ up as soon as the alarm goes off in the morning but this morning Albert didn’t even hear the alarm. In fact, he probably
(28) ____ up until eight o’clock or even later if his mother hadn’t got up to see if Albert had left for school yet. She was
surprised to find him still in bed and shook him hard until he got out of bed. When Albert finally (29) ____ school, the
second lesson had already begun and the class was having a test. As soon as Albert took his seat and looked at the test paper,
he wished that he (30) ____ to school after that. He couldn’t answer even one question on the test paper as he had completely
forgotten to study for the test the night before.
26. A. Most things B. Something C. Nothing D. Everything

27. A. got B. gets C. has got D. is getting
28. A. won’t wake B. won’t have woken C. didn’t wake D. wouldn’t have woken
29. A. reached B. arrived C. went D. got
30. A. wouldn’t go B. won’t go C. hadn’t gone D. didn’t go
V. Choose the option among A, B, C, or D provided the one whose stress pattern is different from others.
31. A. damage B. refund C. appear D. entire
32. A. incentive B. advantage C. photograph D. impression
VI. Choose the option among A, B, C, or D provided the one whose underlined part pronounced differently from others.
33. A. stacks B. major C. wastes D. irrigation
34. A. hall B. ball C. tall D. shall
35. A. sound B. bound C. country D. count
VII. Read the text carefully then choose the option among A, B, C, or D provided the best one to complete each of the
following questions.
Is your life full of stress? Maybe it is your astrological sign. A study in Australia last year said signs with the most
stress are Aquarius (Jan 20 to Feb 18), Gemini (May 21 to June 20) Virgo (Aug 23 to Sept 22) and Cancer (June 21 to July
22). The people who have peaceful lives are under the signs of Pisces (Feb 21 to March 20) , Scorpio (Oct 23 to Nov 22, and
Taurus (April 21 to May 20). Kathleen Johnson, a Vermont astrologer, decided to continue the work. . She now has a stress
chart that decides which marriages and friendships will be most harmonious and which will be most stressed. Johnson says
that any sign together with Pisces or Scorpio will probably have an easy and peaceful time. But signs that are put together
with Aquarius would always be stressed. And marriage of Aquarius to Aquarius have no possibility of success. Says Johnson,
"We should all work together. If I know something as an astrologer that would help you as a doctor or psychotherapist, why
not?"
36. Some friendships are more ____ than others.
A. harmonious B. decided C. astrological D. religious
37. What is the most important idea in this text?
A. You should by an astrology book to read. B. Your astrological sign can be important in a friendship.
C. It will help your marriage if you study astrology. D. We should all work together.
38. A Scorpio who marries a Pisces will be ____.
A. stressed B. peaceful C. unsuccessful. D. happy
39. Johnson believes that Taurus is a ____ sign.

A. peaceful B. easy C. stressed D. unhappy
40. According to Johnson Aquarius is a ____ sign.
A. friendly B. happy C. stressed D. peaceful
THE END
VINH PHUC
EDUCATION & TRAINING SERVICE
Lien Son High School

WRITTEN test
Time allowance: 45 minutes


Nội dung đề số 563
I. Choose the option among A, B, C, or D provided the one whose underlined part pronounced differently from others.
01. A. country B. sound C. bound D. count
02. A. stacks B. irrigation C. major D. wastes
03. A. ball B. hall C. tall D. shall
II. Choose the option among A, B, C, or D provided the best one to complete each of the following incomplete sentences.
04. Tam looked as if ____.
A. he has seen a ghost B. a ghost did he see C. he had seen a ghost D. a ghost he had seen
05. ____ isn’t obvious.
A. Which route would be best B. The best route should be
C. The best route would be D. That route would be best
06. I was surprised at ____.
A. how cold it was B. how cold was it C. how it was cold D. how was it cold
07. We would go out if ____.
A. we are free B. it will be sunny C. we will have time D. it were sunny
08. ____, people start shouting and cheering for one side or the other.
A. as soon as the game begins B. soon the game begins C. if the game begin D. beginning the game
III. Choose the option among A, B, C, or D provided the best one to complete each of the following incomplete sentences.

09. If the machine is not properly operated, it may ____ down.
A. break B. broke C. broken D. breaking
10. This is the book that I want you to read ____.
A. all B. through C. quick D. across
11. Peter goes to the window and ____ down. There's a Mercedes waiting for him.
A. turns B. views C. sees D. looks
12. A sudden noise from the streets ____ me out of my dream.
A. made B. drove C. brought D. called
13. When she left school last year, she went ____ into the drama college.
A. straightly B. straight C. right D. rightly
14. He drove so carelessly that he was sure to ____ an accident.
A. cause B. see C. meet D. make
15. Look at the crowd. I ____ what they are waiting for.
A. don't know B. interested C. see D. wonder
16. Harry Potter has been____ in the U.S and many other countries around the world.
A. showing B. showed C. show D. shown
17. It is my great ____ to meet you here.
A. pleasure B. pleased C. pleasing D. please
18. This is my ex-wife. We got ____ two years ago.
A. divorces B. divorce C. divorced D. divorcing
19. When the police arrived, all the money in the bank had ____.
A. run B. stolen C. disappeared D. lost
20. All the men but one ____ present last night.
A. were B. was C. is D. are
21. There are so many people in the street that the police couldn't do ____.
A. everything B. nothing C. anything D. most things
22. The men here are very handsome, but I ____ you. Please come!
A. miss B. see C. remember D. look
23. My uncle's office is on ____.
A. third floor B. the third floor C. floor three D. three's floor

IV. Read the text carefully then choose the option among A, B, C, or D provided the best one to complete each of the
following questions.
Is your life full of stress? Maybe it is your astrological sign. A study in Australia last year said signs with the most
stress are Aquarius (Jan 20 to Feb 18), Gemini (May 21 to June 20) Virgo (Aug 23 to Sept 22) and Cancer (June 21 to July
22). The people who have peaceful lives are under the signs of Pisces (Feb 21 to March 20) , Scorpio (Oct 23 to Nov 22, and
Taurus (April 21 to May 20). Kathleen Johnson, a Vermont astrologer, decided to continue the work. . She now has a stress
chart that decides which marriages and friendships will be most harmonious and which will be most stressed. Johnson says
that any sign together with Pisces or Scorpio will probably have an easy and peaceful time. But signs that are put together
with Aquarius would always be stressed. And marriage of Aquarius to Aquarius have no possibility of success. Says Johnson,
"We should all work together. If I know something as an astrologer that would help you as a doctor or psychotherapist, why
not?"
24. Johnson believes that Taurus is a ____ sign.
A. peaceful B. stressed C. unhappy D. easy
25. According to Johnson Aquarius is a ____ sign.
A. peaceful B. stressed C. happy D. friendly
26. A Scorpio who marries a Pisces will be ____.
A. stressed B. peaceful C. happy D. unsuccessful.
27. Some friendships are more ____ than others.
A. harmonious B. decided C. religious D. astrological
28. What is the most important idea in this text?
A. Your astrological sign can be important in a friendship. B. You should by an astrology book to read.
C. It will help your marriage if you study astrology. D. We should all work together.
V. Choose the option among A, B, C, or D provided the one whose stress pattern is different from others.
29. A. damage B. entire C. appear D. refund
30. A. incentive B. impression C. photograph D. advantage
VI. Choose the option among A, B, C, or D provided the best one to complete each of the following gaps of the incomplete
passage.
Yesterday was a bad day for Albert. (31) ____ seemed to go right for him. First of all, he woke up late for school.
That was unusual for Albert because he always sets his alarm clock for 6:30 before going to bed at night and have always (32)
____ up as soon as the alarm goes off in the morning but this morning Albert didn’t even hear the alarm. In fact, he probably

(33) ____ up until eight o’clock or even later if his mother hadn’t got up to see if Albert had left for school yet. She was
surprised to find him still in bed and shook him hard until he got out of bed. When Albert finally (34) ____ school, the
second lesson had already begun and the class was having a test. As soon as Albert took his seat and looked at the test paper,
he wished that he (35) ____ to school after that. He couldn’t answer even one question on the test paper as he had completely
forgotten to study for the test the night before.
31. A. Most things B. Something C. Nothing D. Everything
32. A. got B. gets C. has got D. is getting
33. A. won’t wake B. won’t have woken C. didn’t wake D. wouldn’t have woken
34. A. reached B. arrived C. went D. got
35. A. wouldn’t go B. won’t go C. hadn’t gone D. didn’t go
VII. Choose the option among A, B, C, or D provided the one that needs correcting to make the sentences right.
36. When she arrives, she will be wearing a blue jeans so that you can recognize her.
A. a B. be C. When D. so
37. As soon as he saw what she did, he told the bus driver to stop.
A. did B. as C. to stop D. saw
38. There was little point to take the car back to the same garage.
A. to take B. same C. little D. car back
39. I was sure that she had recognized me and so I must talk to her.
A. that B. to C. must D. and so
40. Most of viewers are children and it is them who are exposed to violence.
A. them B. children C. to D. Most
THE END
VINH PHUC
EDUCATION & TRAINING SERVICE
Lien Son High School

WRITTEN test
Time allowance: 45 minutes

Nội dung đề số 574

I. Choose the option among A, B, C, or D provided the one whose stress pattern is different from others.
01. A. photograph B. impression C. advantage D. incentive
02. A. refund B. entire C. appear D. damage
II. Read the text carefully then choose the option among A, B, C, or D provided the best one to complete each of the
following questions.
Is your life full of stress? Maybe it is your astrological sign. A study in Australia last year said signs with the most
stress are Aquarius (Jan 20 to Feb 18), Gemini (May 21 to June 20) Virgo (Aug 23 to Sept 22) and Cancer (June 21 to July
22). The people who have peaceful lives are under the signs of Pisces (Feb 21 to March 20) , Scorpio (Oct 23 to Nov 22, and
Taurus (April 21 to May 20). Kathleen Johnson, a Vermont astrologer, decided to continue the work. . She now has a stress
chart that decides which marriages and friendships will be most harmonious and which will be most stressed. Johnson says
that any sign together with Pisces or Scorpio will probably have an easy and peaceful time. But signs that are put together
with Aquarius would always be stressed. And marriage of Aquarius to Aquarius have no possibility of success. Says Johnson,
"We should all work together. If I know something as an astrologer that would help you as a doctor or psychotherapist, why
not?"
03. Some friendships are more ____ than others.
A. decided B. astrological C. harmonious D. religious
04. Johnson believes that Taurus is a ____ sign.
A. unhappy B. easy C. peaceful D. stressed
05. According to Johnson Aquarius is a ____ sign.
A. stressed B. happy C. friendly D. peaceful
06. A Scorpio who marries a Pisces will be ____.
A. happy B. stressed C. unsuccessful. D. peaceful
07. What is the most important idea in this text?
A. We should all work together. B. It will help your marriage if you study astrology.
C. Your astrological sign can be important in a friendship. D. You should by an astrology book to read.
III. Choose the option among A, B, C, or D provided the one that needs correcting to make the sentences right.
08. When she arrives, she will be wearing a blue jeans so that you can recognize her.
A. be B. When C. so D. a
09. As soon as he saw what she did, he told the bus driver to stop.
A. as B. saw C. to stop D. did

10. Most of viewers are children and it is them who are exposed to violence.
A. them B. to C. Most D. children
11. I was sure that she had recognized me and so I must talk to her.
A. and so B. that C. must D. to
12. There was little point to take the car back to the same garage.
A. to take B. little C. car back D. same
IV. Choose the option among A, B, C, or D provided the one whose underlined part pronounced differently from others.
13. A. country B. sound C. bound D. count
14. A. major B. wastes C. stacks D. irrigation
15. A. tall B. ball C. shall D. hall
V. Choose the option among A, B, C, or D provided the best one to complete each of the following incomplete sentences.
16. I was surprised at ____.
A. how it was cold B. how cold was it C. how cold it was D. how was it cold
17. Tam looked as if ____.
A. a ghost he had seen B. a ghost did he see C. he had seen a ghost D. he has seen a ghost
18. ____ isn’t obvious.
A. That route would be best B. Which route would be best
C. The best route would be D. The best route should be
19. We would go out if ____.
A. we are free B. we will have time C. it will be sunny D. it were sunny
20. ____, people start shouting and cheering for one side or the other.
A. soon the game begins B. beginning the game C. as soon as the game begins D. if the game begin
VI. Choose the option among A, B, C, or D provided the best one to complete each of the following gaps of the incomplete
passage.
Yesterday was a bad day for Albert. (21) ____ seemed to go right for him. First of all, he woke up late for
school. That was unusual for Albert because he always sets his alarm clock for 6:30 before going to bed at night and have
always (22) ____ up as soon as the alarm goes off in the morning but this morning Albert didn’t even hear the alarm. In fact,
he probably (23) ____ up until eight o’clock or even later if his mother hadn’t got up to see if Albert had left for school yet.
She was surprised to find him still in bed and shook him hard until he got out of bed. When Albert finally (24) ____ school,
the second lesson had already begun and the class was having a test. As soon as Albert took his seat and looked at the test

paper, he wished that he (25) ____ to school after that. He couldn’t answer even one question on the test paper as he had
completely forgotten to study for the test the night before.
21. A. Most things B. Something C. Nothing D. Everything
22. A. got B. gets C. has got D. is getting
23. A. won’t wake B. won’t have woken C. didn’t wake D. wouldn’t have woken
24. A. reached B. arrived C. went D. got
25. A. wouldn’t go B. won’t go C. hadn’t gone D. didn’t go
VII. Choose the option among A, B, C, or D provided the best one to complete each of the following incomplete sentences.
26. Peter goes to the window and ____ down. There's a Mercedes waiting for him.
A. turns B. views C. sees D. looks
27. The men here are very handsome, but I ____ you. Please come!
A. see B. look C. miss D. remember
28. It is my great ____ to meet you here.
A. please B. pleasure C. pleased D. pleasing
29. This is my ex-wife. We got ____ two years ago.
A. divorced B. divorcing C. divorces D. divorce
30. My uncle's office is on ____.
A. third floor B. three's floor C. the third floor D. floor three
31. He drove so carelessly that he was sure to ____ an accident.
A. make B. cause C. see D. meet
32. When the police arrived, all the money in the bank had ____.
A. disappeared B. lost C. stolen D. run
33. There are so many people in the street that the police couldn't do ____.
A. anything B. everything C. nothing D. most things
34. All the men but one ____ present last night.
A. was B. are C. were D. is
35. If the machine is not properly operated, it may ____ down.
A. broken B. broke C. breaking D. break
36. When she left school last year, she went ____ into the drama college.
A. straight B. right C. straightly D. rightly

37. A sudden noise from the streets ____ me out of my dream.
A. called B. brought C. drove D. made
38. Harry Potter has been____ in the U.S and many other countries around the world.
A. showing B. shown C. showed D. show
39. Look at the crowd. I ____ what they are waiting for.
A. wonder B. don't know C. see D. interested
40. This is the book that I want you to read ____.
A. across B. through C. all D. quick
THE END
ĐÁP ÁN
531 542 563 674 531 542 563 674
1 B C A A 21 B A C C
2 A A A D 22 A C A A
3 A A D C 23 C B B D
4 B B C C 24 C C A A
5 D B A A 25 A A B C
6 B C A D 26 D C B D
7 A C D C 27 C A B C
8 C B A D 28 A D A B
9 A A A D 29 C A A A
10 C D B A 30 C C C C
11 D A D C 31 A A C B
12 A A C A 32 A C A A
13 C B B A 33 A A D A
14 A D A C 34 C D A A
15 D A D C 35 C C C D
16 A C D C 36 C A A A
17 C D A C 37 B B A B
18 A B C B 38 A B A B
19 C D C D 39 C A C A

20 B B B C 40 A C A B