50. You must remember _________.

　　 A. what your teacher said　　　　　　　　　 B. what did your teacher say

　　 C. what has your teacher said　　　　　　　　 D. your teacher said what

49. In most middle schools, students _________ to wear long hair.

　　 A. don't allow　　　　 B. won't allow　　　　 C. aren't allowed　　 D. aren't allowing

48. We believe that scientists will soon _________ a way to cure the terrible disease.

　　 A. get on with　　　　 B. go on with　　　　 C. catch up with　　 D. come up with

47.--Our English teacher _________ to America, hasn't she?

　　--Yes. At least twice.

　　 A. has gone　　　　 　B. will go　　　　　 　C. went　　　　　　 D. has been

46. When I went into the living room, I found Jack _________ TV with his little brother.

　　 A. watched　　　　　 B. is watching　　　　 C. watching　　　　 D. to watch

45. He is too poor to go to school, so he can _________ read _________ write.

　　 A. neither; nor　　　 B. either; or　　　　　 C. both; and　　　　 　D. not only; but also

44. Which of the following is used for sending a letter?