30.Why don't you put the meat in the fridge? It will _______ fresh for several days.

A.be stayed 　　B. stay 　　C. be staying 　　D. have stayed

29.If it　　　　 for the snow, we　　　　 the mountain yesterday.

A.were not; could have climbed　　　 B.were not; could climb

C.had not been; could have climbed　 D.had not been; could climb

28.Eliza remembers everything exactly as if it 　　　　　　yesterday.

A. was happening　 B. happens　 　　C. had happened　　 D. happened

27. 　　　　　I accept that he is not perfect, I do actually like the person.

A. While　　　 B. Since　　　　 C. Before　　 D. Unless

26.He slept well　　　 all the windows open.

A.when　　　 B.while　　　C.with　　　 D.because

25.As I know, there is ____ car in this neighborhood.

A.　　 no such　 B. no a　 C. not such　 D. no such a

24.Helen was much kinder to her youngest son than the others, ______, of course, made the others envy him　.

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

23.While watching television, __________.

A.the doorbell rang　　　　　　　 　　　B．the doorbell rings

C.we heard the doorbell ring　　　 　D．we heard the doorbell rings

22.They _______ on the program for almost one week before I joined them, and now we ________ it as no good results have come out so far.

A. had been working; are still working　　 B. had worked; were still working

C. have been working; have worked　　 　D. have worked; are still working

从下列各句的A、B、C、D四个选项中选择一个最佳答案。

21.He transplanted the little tree to the garden _______ it was the best time for it.

A. where　　　　 B. when　 C. that　 　D. until