----- Nội dung dịch tự động từ ảnh -----
Exercise 4

1. Why are you so late? I am waiting here for you for more than one hour.
(A)
(B)
(C)
(D)

2. Phuc never go to bed before he has finished his homework.
(A)
(B)
(C)
(D)

3. I have learnt English for I was ten years old.
(A)
(B)
(C)
(D)

4. Yesterday evening while I was watching TV, Mai pays me a visit.
(A)
(B)
(C)
(D)

5. We went out for a walk after we had our dinner.
(A)
(B)
(C)
(D)

6. As soon as the next lecture will end, let’s leave.
(A)
(B)
(C)
(D)

7. Mr. Ba had a daughter who were born in 1950, but who died a few years later.
(A)
(B)
(C)
(D)

8. After they were playing cards, someone broke into the house.
(A)
(B)
(C)
(D)

9. A city university professor reported that he discovers a vaccine which could prevent bird flu.
(A)
(B)
(C)
(D)

10. Factories discard waste that had polluted air and water, but factories give up employment.
(A)
(B)
(C)
(D)