42.He walked down the hills, ____softly to himself.　　　　　　　 　A.sing　　 B.singing　　 C.sung　　 D.to sing

41.At this moment the bell rang ____　the end of class.　　　　　　 　A.announce　　 B.announcing　　 C.announced　　 D.to announce

40.The child sat in the dentist's chair ____.　　　　　　　　　 　A.tremble　　 B.trembling　　 C.trembled　　 D.to trembled

39.Properly 　____　with numbers, the books can be easily found.　　 　A.marked　　 B.mark　　 C.to mark　　 D.marking

38.Were you ____when you saw that wild animal?　　　　　　　　　 　A.fright　　 B.frightening　　 C.frightened　　 D.frighten

37. ____the composition, John handed it to the teacher and went out of the room　　　　　　　　　　　　　　　　　　　　　　　　 　A.Writing　 B.Having written 　C.Written　　 D.Being written

36."Can you read?" Mary said ________________to the notice.　　　　　　　 　A.angrily pointing　 B.and point angrily 　C.angrily pointed 　 D.and angrily pointing

35.The visiting Minister expressed his satisfaction with the talks, ____that he had enjoyed his stay here. 　　　　　　　　　　　　　　 　A.having added　　 B.to add　　 C.adding　　 D.added

34."We must keep a secret of the things 　_______here", the general said, ____at the man in charge of the imformation office.　　　　　　 　A.discussed, stared seriously 　B.being discussed, seriously staring 　C.to be discussed, seriously stared 　D.discussed, stared

32.The old sick lady entered the hospital, ____　her two sons.　　　　 　A.to support　 B.supporting 　C.supported by　 D.having supported

a is one of the largest countries in the world, ____　9.6 million square (平方)kilometres.　　　　　　　　　　　　　　　　　　　　 　A.to cover　　 B.covered　　 C.covers　　 D.covering