13. You don’t use the Internet very often,________ ? A. are you B. haven’t you C. don’t you D. do you 14. He thinks that ________ on the Internet is a waste of time. A. chat B. chatting C. chater D. to chat 15. She said I _________ learn harder _________ pass the exam. A. had/ in order to B. should/ so as to C. must/ in order D. will/ so as to 161. He told me that he wasn’t ________ about the next meeting. A. excite B. exciting C. excitement D. excited 17. Everyone must take part in _________ deforestation. A. prevent B. to prevent C. preventing D. prevented 18. There is a football match ............. 6 pm and 8pm. A. at B. between C. from D. after 19. They are ........... by about 640 km of the sea. A. separated B. separate C. separately D. separating 20. How about ............... to the exhibition ? A. going B. go C. goes D. to go