11. In 1876, the telephone ______________________first introduced by Bell and Watson.
a. was b. is c. has been d. had been
12. It’s important ______________________wildlife in the area.
a. to conserve b. conserving c. conservation d. conserve
13. Japan ______________________40% of its waste.
a. reuses b. recycles c. refill d. broken
14. We were delighted______________________your letter yesterday.
a. to get b. got c. getting d. get
15. Sooner or later a satellite ______________________by a large piece of rubbish.
a. will destroy b. will destroyed c. will be destroyed d. will been destroyed
16. Let’s play tennis instead of ______________________television.
a. watch b. watching c. watches d. to watch
17. Everything depends on what you mean______________________the word “free”.
a. about b. by c. of d. for
18. We should use______________________bags instead of plastic bags.
a. cloth b. clothe c. clothed d. clothing
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