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1.“I don’t like to travel. ”“Have you ever _____ in an airplane?” a. flying b. flew c. flowed d. flown 2.The center of gravity of the human body ______ behind his joint. a. located b. locating c. to locate d. is located 3.“Today is very cold, isn’t it?” “Yes, the river is _____ over.” http://yingyu.chazidian.com a. freezed b. freeze c. frozen d. freezing 4.“What happened in that new area?” “New houses ______ recently over there.” a. are built b. build c. have built d. have been built 5.“When did you go to work?” “As soon as they came, we ______ to work.” a. went b. were going c. had gone d. go 6.“Did you wait for him very long?” “Yes, I ______ to bed until five in the morning.” a.did go b. didn’t go c. had gone d. went 7.Perhaps it will be a long time ______ from abroad. a. when Tom comes back b. when Tom will come back c.before Tom comes back d. that Tom comes back 8.Tom ______ mathematics throughout his college life. a. bored b. bored with c. was bored d. was bored with 9.______ that dress when I first saw you at the station? a. Were you wearing b. Have you worn c. Did you wear d. do you wear 10.Mr Wu ______ to work by bus every day. a. has been traveling b. has traveled c. travels d. is traveling 11.Don’t disturb him. He ______ to the weather forecast. a. listens b. is being listened c. has listened d. is listening | 
