35. ---Sorry, I'm too busy to join you.

　　 ---Never mind. ______, we'll have to start without you.

　　 A .If possible　　　　　 B. In that case　　　　　 C. However　　　　　 D. Therefore

34.---I called you at about ten, but there was no reply.

　　 ---Oh, that was probably ______ I was taking a shower.

　　 A. when　　　　　 B.how　　　　 C.why　　 　　　　D. whether

33.I hadn't expected them ______ for me when I arrived there so late.

　　 A. to wait　　　　　 B. to be waiting　　　　　 C. to have waited　　　　　 D. to have been waiting

32. The company decided to put the plan into ______ operation as it was ______ most practical.

　　 A.an; a　　　　 B.the; the　　　　 C.不填;不填　　　　 D.an; 不填

31.---That dog's running round again. The Smiths should keep it in the fence or at least______

　　 ---I'll talk to them about it.

　　 A. tied up　　　　　 B. tying up　　　　　 C. tie up　　　　　　 　D. to tie it up