84. Now many children like surfing _______ the Internet, but _______ the same time they should know that there is something unhealthy on it.

　 A. for; in　 B. at; by　 　C. on; at　 D. in; on

83. Thanks _______ our teacher, we solve the problem _______ her help.

　 A. for; without　 B. to; with　 C. for; with　　 D. to; without

82. --- I’m not good _______ remembering names.　 　--- Neither am I.

　 A. in　 B. on　 C. at　 D. with

81. The thief got in _______ the window.

　 A. through　 B. across　 C. over　 D. after

80. _______ an English-Chinese dictionary, the word “sing” comes _______ the word “king”.

　 A. On; before　 B. For; among　 C. At; between　 D. In; after

79. --- Do you know the student _______ David　and Jeff?　 　--- Yeah. It’s Jim.

　 A. among　 B. in　 C. between　 D. around

78. --- What are they doing, dad?　 　--- They are putting up a picture _______ the　front wall.

　 A. on　 B. at　 C. in　 D. over　

77. --- I think that waste paper and bottles should　be collected _______ recycling.

　 --- I agree _______ you.

　 A. by; for　　 B. as; at　 　C. for; with　 D. from; as

76. --- How long have you been _______ this　school?　 --- Two years.

　 A. to　 B. for　 C. of　 D. in

75. We won the game by 5 _______ 3.

　 　A. to　 B. by　 C. over　 D. on