12. A

13. A

14. A

15. D

16. B

17. A

18. A

19. C

20. B

Nguyên nhân sâu xa nào dẫn đến bùng nổ các cuộc khởi nghĩa lớn của nhân dân ta trong các thế kỉ VII-IX?

Mâu thuẫn giữa chính quyền đô hộ và nhân dân ta. Mâu thuân giữa nông dân và địa chủ người Hán. Chính quyền dô hộ ngày càng suy yếu. Nhân dân ta chuẩn bị đầy đủ lực lượng để khởi nghĩa.

 3x + 5y ⋮ 7

= 5.(3x + 5y) ⋮ 7

= 15x + 25y ⋮ 7 (1)

Lại có: 14x ⋮ 7; 21y ⋮ 7 => 14x + 21y ⋮ 7 (2)

Lấy (1) trừ (2), ta có:

(15x + 25y) - (14x + 21y) ⋮ 7

=> x + 4y ⋮ 7

VI. Rewrite each of the following sentences, beginning with the given words.

1. There / be / small / pond / front / Lam / house.

 =>There is a small pond in front of Lan's house

2. You / can / games / afternoon / but / must / homework / evening.

 =>You can play games in the afternoon but you must do your homework in the evening

3. Lan / walk / ride / bike / school?

  =>Does Lan walk or ride a bike to schook?

4. When / it / hot / we / often / go / swim.

=>When it is hot we often go swimming

5. What / there / front / your house?

=>What are there in front of your house?

6. Where / your father / sit / now?

=>Where is your father sitting now

7. My class / start / seven / morning.

=>My class starts at seven in the morning

8. I / not often / swimming / friends.

=>I don't often go swimming with my friends

VII. Rewrite each of the following sentences, beginning with the given words.

Ex:            It took her 3 hours to get to the city centre.

                => She spent 3 hours getting to the city centre.

1. Does your class have thirty students?

-  Are there thirty students in your clas ?

2. How much does a bowl of noodlles cost?

-  How much is a bowl of noodles?

3. He often walk to school.

-  He often goes to school on foot

4. Mr.Brown has a daughter, Hoa.

-  Mr.Brown is Hoa's father

5. What is the length of this river?

-  How long is this river ?

6. What is the price of this hat?

-  How much does this hat cost ?

7. What is the price of a cake and an orange?

-  How much do a cake and an orange ?

8. That book belongs to Nam.

-  That is Nam's book.

Topic1: Talk about your favourite TV programme.

Câu 2: There are many sports that are good for our health and are popular around the world. Football is one of my favorite sports. It is played by two teams of 11 each. The general rule of thumb is that football is played with feet and players get points when they have the ball in goal. Football is known as "king" in other sports. We usually kick soccer every Thursday. Soccer helps me feel better mentally. Even though we were very tired, we were all very happy. I really like soccer