22. We’ll wait here ____ you get back.

　 A. soon after　 　　　　 B. until　 　　　　　　 C. as soon as　　 　　　　　 D. when

21. Richard is ____ boy that everyone in the class likes him.

　 A. a so bright　 　　　　　　　 B. so a bright　 　　 C. such bright a　　 　　　 D. so bright a

20. I have kept that portrait ____ I can see it every day, as it always reminds me of my university days in London.

　 A. which　 　　　　　　 B. where　 　　　　　 C. whether　 　　　　　　　　　　 D. when

19. No sooner had we reached the top of the hill ____ we all sat down to rest.

　 A. when　　 　　　　　　 B. then　　 　　　　　 C. than　 　　　　　　　　　　 D. until

18. I felt somewhat disappointed and was about to leave ____ something occurred which attracted my attention.

　 A. unless　 　　　　　　 B. until　 　　　　　　 C. when　 　　　　　　　　　 D. while

17. I was just to go out ____ it began to rain.

　 A. as　　 　　　　　　　　 B. when　　 　　　　 C. after　　 　　　　　　　　 D. whole

16. Michael used to look hurt and surprised when ____ .

　 A. scolding　 　　　　　 B. to scold　 　　　　 C. having scolded　 　　 D. scolded

15. ____ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.

　 A. Even if　　 　　　　　 B. As far as　 　　　 C. If only　 　　　　　　　　 D. So long as

14. Excuse me. If your call’s not too urgent, do you mind ____ mine first.

　 A. I make　　 　　　　　 B. if I make　　 　　 C. me to make　　 　　　　　　　 D. that I make

13. Although he knew little about the large amount of work done in the field, he succeeded ____

other more well-informed experimenters failed.

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