20. There will be an English exam next week. My English needs _________.

A. studying carefully　　　　 　　 B. to study carefully

C. reading and writing　　　　 　 D. to studying carefully

19. The problem _______ keenly now is of great importance.

A. to be discussed　　　　 B. being discussed

C. that discussed　　　　　 D. having been discussed

18. Your time should have been made full use of _______ the final exams, but to my regret, it wasn’t.

A. to pass　　　　　　 B. passing　　　　　　 C. to have passed 　　 D. having passed

17. Tony will never forget these days ＿＿＿she lived in China with her mother,＿＿＿has a great effect on her life.

　 A. that； which　 B. when； which　 C. which； that　　 D. when； that

16. _______, the climbers would try their best to reach its top without the aid from other people.

A. However the mountain might be high　

B. However high the mountain might be

C. No matter how the mountain might be high

　 D. No matter high the mountain might be

15. -Is this the studio you referred to?

　　　 -Right, just the one　　 　you know I used to work for years.

　　　 A. where　　　　　 B. which　　　 C. that 　　　　　　　　　 D. what