53. A. caught B. arranged C. left D. convinced
52. A. dirty B. clean C. old D. new
51. A. point out B. take out C. hand out D. print out
50. A. can’t B. mustn’t C. won’t D. needn’t
49. A. agreed B. proposed C. refused D. denied
48. A. control B. affect C. remove D. replace
47. A. chemistry B. physics C. biology D. psychology
46. A. but B. however C. so D. therefore
45. A. supported B. grasped C. placed D. strengthened
44. A. on B. against C. toward D. under
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