41.  They must use ten years and worked day and night to pay back the money.

42.  On the morning we will go to the great Wall and have lunch there.

43.  Travellers and business people both at home and abroad have been greatly helped by this new computer.

44.  I can get up a little later, and then do some excises, such as running, play dumbbell and so on.

45.  After breakfast, I often have some read and then do my homework.

46.  No body is hurt and killed.

47.  Four of them have already been finished teaching and began reviewing four weeks ago .

48.  I prepare the lantern and will play in the evening.

49.  They often talk with us after class and often help us to do everything in class.

50.  In two weeks, I do my homework every day and go over the lesson.