Keys:

　　1—10 BCCAC BADCC 11—20 DBAAC DACBC 21—30 BDDCB AABCA 31—40 DCBDA CBCCD 41—50 BABCD CDACA 51—55 DCDAC

　　56. 去掉 were 　　　　　 57. 去掉 time　　　　　　 58. placing → placed　　　　　 59. in → on 60. some of → some　 61. sticks → stick to　　　　　 62. take → carry　 63. have → had 　　　　 64. √　　　　 65. cloud → cloudy

　　書面表達:

　　One day on his way home, Mr Smith saw a thief carrying a TV set and a record running along the street hurriedly. He didn't stop the thief. Instead, he pulled down his hat and pretended not to have seen him. A few minutes later, a policeman stopped him and asked if he had seen a man with a TV set and a record pass by. Mr Smith answered that he hadn't. The policeman, however, soon caught the thief. When Mr Smith got home, he was surprised to see that it was his own things that had been stolen.