43. If the sky is clear, you can see the stars ________ night.

A. at                B. in                            C. on                           D. when

44. The first man walked on the moon ________ 21 July 1969.

A. in                            B. at                            C. on                           D. no preposition

45. In Britain people send each other cards ________ Christmas.

A. in                            B. on                           C. at                            D. till

46. If she has too much to do, she must ask someone ________ her.

A. to help                    B. help                        C. helping                   D. helps

47. If she isn’t coming tonight, he might ________ next week.    

A. to come                  B. coming                   C. came                       D. come.

48.  Tom asked her where she ________

A. was going               B. goes                        C. will go                    D. are going

49.  The teacher told us ________

A. not to talk               B. not talk                   C. not talking              D. don’t talk

50. You must be more polite ________ the customers

A. of                            B. to                C. with                        D. at

51. If the sky is clear, you can see the stars________ night.
            A. at                            B. in                            C. on                           D. between

52. I wish the sun ________ shining right now.
            A. is                            B. are                          C. were                        D. would
53. ________ Saturday night I went to bed at 11 o’clock.
            A. In                            B. on                           C. at                            D. after