53. A. not talk B. to not talk C. not to talk D. not talking
52. A. glad B. satisfied C. proud D. familiar
51. A. as B. to C. with D. like
50. A. losing B. lose C. lost D. losed
49. A. it B. them C. anything D. something
48. A. gone B. visited C. seen D. been
47. A. On B. In C. All D. By
46. A. Shall B. Will C. Must D. Do
45. A. to B. better C. not D. like
44. A. understood B. understanding C. surprised D. surprising