50. A. first                B. nice                  C. next                  D. back

A

Most children like watching TV. It’s very interesting. By watching TV, they can see and learn a lot and know many things about their country and the world. Of course, they can also learn over the radio. But they can learn better and more easily on TV. Why? It’s because they can hear and watch at the same time. But they can't see anything over the radio. 

TV helps to open children's eyes. TV helps to open their minds (智力), too. They can learn newer and better ways of doing things. They may find the world is now smaller than before.

Many children watch TV on Saturday or Sunday evening. They are always busy with their lessons. But a few children watch TV every night. They go to bed very late. They can't have a good rest. How about you, my young friend?

49. A. clever              B. big                   C. good                 D. shy

48. A. say                  B. saying               C. cries                 D. says

47. A. seven              B. seven’s              C. seventh             D. the seventh

46. A. In                   B. On                    C. At                    D. To

45. A. eat                  B. not eat              C. eat many           D. doesn’t eat