23.The police investigated thoseabout the traffic accident.

37.a wonderful trip he had when he traveled in China!

36.It was because it rained heavily yesterdayhe could not come to the evening school on time.

35.It is during his spare timeDavid has been working on making his motorbike.

34., he is one of those who have made the most important contributions to the organization.

33.There wasn＇t anyone in the room at that time, ?

32.Go and get some water, ?

31.He used to get upatsixin the morning, ?

30.You never told us his phone number, ?

29.He must have stayeduplate last night, he?

28.Let us put the matter to the vote and not waste our time arguing about it, ?