24.Seeing is _________.

　　 A.to believe　 B.believing　 C.believed　 D.being believed

23.__________ clean is a safeguard against disease.

　　 A.To be keeping　 B.Kept　 C.Keep　　 D.Keeping

22.What about _________ to the concert with us ?

　　 A.we go　 B.we going　 C.going　 D.to go

21.Besides __________, she is kind and tender.

　 A.beautiful　　　 B.being beautiful

　 C.she beautiful　　 D.is beautiful

20.You should work tonight instead of __________ TV.

A.to watch　 B.you watching　 C.you watch　 D.watching

19.He was praised for _________ thirty years of touching.

plete　 B.he completed

　C.having completed　 D.to have been completed

18.You must pay attention to _________ the works of Lu Xun.

　　 A.read　　 B.reading　 C.reader　　 D.be read

17.We are both looking forward to __________ next week.

　　 A.going on vocation(休假)　 B.go on vocation

　　 C.be going on vocation　　　 D.have gone on vocation

16.He devoted his life to __________ the atomic theory.

　A.study　 B.be studied　 C.studying　　 D.have studied

15.The farmers were busy __________ cotton.

　　 A.to pick　　 B.picking　　 C.with picking　 D.pluck