17.Theof the killer is still unknown, which is why the citizens are rather worried.

43.fast he runs!

42.It was Luciarescued the drowning child.

41. some more time, and I will find a solution to the problem.

40.You and I could hardly work together, ?

39.a strange plant! 1 have never seen it before.

38.at the door before you enter the room, please.

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.