21.Medicine should not be kept it is approachable to children.

39.The engineer tried tothe problem with several drawings.

38.Hethe old man with 10 pounds for bringing back his lost dog.

37.The bad weatherthe building program by several weeks.

36.The football player is hoping toto another team soon.

35.After making the speech, he went it through in his mind to reflect where hebetter.

34.The teacher asked a difficult question, but finally Petera good answer.

33.I think the whole paper has to be rewritten； only the first few paragraphs may be.

32.I don＇t know whether what he said is true, but I＇ 11 try to it.

31.Only one little boythe accident; everyone else was killed.

30.The date of the meeting has beenfrom June 5th to June 8th.