Question 15. The _____friendly products are designed not to harm the natural environment.

A. environmentally B. environmental C. environmentalist D. environment

Giải thích :

- Để bổ nghĩa cho adj ta cần cần adv

adj : tính từ

adv : trạng từ

Question 16. I suggest that he _____more efforts in his work.

A. makes B. should make C. making D. to make

Giải thích :

- Should make: nên làm 

- suggest: đề nghị 

Question 17. I have four dictionaries. Two are Japanese and ______others are English

A. a B. an C. the D. X

Giải thích :

- the others: những thứ khác 

Question 18. I want to talk to my teacher about my problems, but I have no idea ________ to start, or ______to talk to him

A. where – how B. what – where C. where – who D. why – whom

Giải thích : 

- where to start: bắt đầu từ đâu 

- how to: làm thế nào để

Question 19. Martin asked me _______.

A. how is my father B. how my father is C. how was my father D. how my father was

Giải thích : 

- Trong câu tường thuật gián tiếp lùi 1 thì: “how my father is” là thì hiện tại, lùi 1 thì thành “how my father was”.