Phát biểu nào sau đây không đúng?

A. Isoamyl axetat có mùi thơm của chuối chín

B. Các este thường dễ tan trong nước

C. Benzyl axetat có mùi thơm của hoa nhài

D. Một số este của axit phtalic được dùng làm chất dẻo

Xét 4 tế bào sinh dục trong một cá thể ruồi giấm cái có kiểu gen trên giảm phân tạo ra số loại trứng tối đa có thể có là

A. 16

B. 8

C. 2

D. 4

Chia động từ trong ngoặc

11. For several years his ambition ________ to be a pilot.

A. is B. has been C. was D. had been

12. Henry________ into the restaurant when the writer was having dinner.

A. was going B. went C. has gone D. did go

13. He will take the dog out for a walk as soon as he ________ dinner.

A. finish B. finishes C. will finish D. shall have finished

14. Before you asked, the letter________

A. was written B. had been written C. had written D. has been written

15. She ________ English at RMIT these days.

A. studies B. is studying C. will study D. is gong to study

16. She's at her best when she________ big decisions.

A. is making B. makes C. had made D. will make

17. We________ next vacation in London.

A. spend B. are spending C. will spend D. are going to spend

18. Robert________ tomorrow morning on the 10:30 train.

A. arrived B. is arriving C. has arrived D. would arrive

19. Look! The bus________

A. left B. has left C. leaves D. is leaving

20. Mike________ one hour ago.

A. phoned B. was phoning C. had phoned D. has phoned