54. ______ the cat family, the small tiger looks like a big cat.
A. being at B. belonged to C. in D. belonging to
53. ---- I don’t understand that sentence let’s get tom ____ the sentence again.
A. explain B. to explain C. explained D. explaining
52. --- I must apologize for ____ ahead of time.
--- That’s all right.
A. letting you not know B not letting you know
C letting you know not D letting not you know
51. Rather than ____ on a crowded bus, he always prefers ____ a bicycle.
A. ride, ride B. riding, ride C. ride, to ride D. to ride, riding
50. The missing boys were last seen ____ near the river.
A. playing B. to be playing C. play D. to play
49. She set out soon after dark ____ home an hour later.
A. arriving B. to arrive C. having arrived D. and arrived
48. The first textbooks ____ for teaching English as a foreign language came out in the 16th century.
A .having written B. to be written C. being written D. written
47. The visiting minister expressed his satisfaction with his talks, ____ that he has enjoyed his stay here.
A. having added B. to add C. adding D. added
46. _____ down the radio ---- the baby’s asleep in the next room.
A. turning B. to turn C. turned D. turn
45. How about the two of us ___ a walk down the garden?
A. to take B. take C. taking D. to be taking