44.　　　　 I’m sorry ___________ (keep) you __________ (wait) for me for such a long time.

43.　　　　 So far, they_________________ (plant) thousands of trees.

42.　　　　 His uncle _______________ (return) in three days.

41.　　　　 These homeless children _____________ (look) after in the SOS village.

40.　　　　 She said she _________________ (not write) to her parents for a long time.

39.　　　　 My brother will call me as soon as he ______________ (reach) here.

38.　　　　 You shouldn’t make him______________ (stand) so long.

37.　　　　 Many tall buildings ________________ (build) in our city during the last few years.

36.　　　　 I _____________ (feed) my cat, so it is full now.

35.　　　　 Sunglasses are used for ____________ (keep) out the sun.