12. B. rehearsing (vì câu này có nghĩa là Nga đang diễn lại một vở kịch cho lễ kỉ niệm thành lập trường)

13. D. visiting (vì sau what about là V - ing)

14. B. at ( vì câu này có nghĩa là một ban nhạc  sẽ tổ chức hòa nhạc ở lễ kỷ niệm)

15. B. to go (vì sau would ... like là to + V)

II.

1. Are there forty classroom in Phong's school?

2. Phuong is Nam's young sister

3. My father usually goes to work by car

4. It is a small house

5. The toystore is to the left of the bookstore

III.

1. Where (be) are your brothers?

- They (study) are studing in library

2. Minh usually (play) plays volleyball after school.

   Now he (play) is playing volleyball in the sports ground

3. Student shouldn't (stay) stay up late

II. 1.Are there forty class rooms in Phong's school?

    2. Phuong is Nam's brother.

    3.My father usually goes by car.

    4.It is a smal house.

    5.The toystore is on the left of the bookstore.

III.1)are/are studying

    2)plays/is playing

    3)stay