34.Mr Taylor went on _________ in spite of illness.

　　 A.to work　 B.worked　　 C.working　　 D.to be working

33.Once the heart stops __________,death follows at once.

　　 A.beating　 B.to beat　　 C.being beaten　 D.to be beating

32.Mike has got used _________ up late at night. (stay up)

　　 A.to sit　　 B.X　　　 C.to sitting　 D.sitting

31.Articles(物品) used by patients must be disinfected(消毒) before ___________ others.　

　　 A.using　　 B.being used by　 C.used by　 D.being using

30.Some foods are eaten without ____________.

A.well absorbing　 B.being well absorbed

　C.absorbing　 D.well absorbed

29.I am sorry for _________ you so much trouble.

　　 A.giving　 B.given　 C.having given　 D.to given

28.Many people enjoy ____________ majiang(麻将).

　　 A.playing　 B.playing the　 C.to play　 D.to play the

27.It is no use ________ without thorough _____________.

A.to read; understood B.reading; understanding

C.to read; understand　 D.read; to understand

26.The microscope is used for _______minute(微小的) objects.

A.examining　　 B.being examed

C.examined　　 D.examine

25.The heart keeps __________ all the time.

　 A.to beat　 B.beating　 C.beaten　 D.to have been beating