20. Over the past decades, sea ice in the Arctic as a result of global warming.
A. had decreased B. decreased C. has been decreasing D. is decreasing
19. Life is like a long race we compete with others to go beyond ourselves.
A. why B. what C. that D. where
18. I like in the autumn when the weather is clear and bright.
A. this B. that C. it D. one
17. It was the long March Rocket 2F, as reported, sent Shenzhou VI spaceship into space.
A. which B. what C. that D. as
16. Don’t leave the water while you brush your teeth.
A. run B .running C. being run D. to run
15. -May I tell this to my close friend?
-No, you . Never let anybody else know about it.
A. needn’t B. shouldn’t C. mustn’t D. can’t
14. The world is changing fast. I strongly believe that one will easily fall behind he keeps on learning.
A. unless B. if C. when D. as
13. His speech at the meeting was really wonderful, and it could never be any .
A. best B. better C. worse D. worst
12. All the indicate that he has been deeply involved in the crime.
A. evidence B. fact C. factors D. cause
11. -Are you free after school?
-Sorry: I’ve planned to treat a friend of mine to dinner for his help.
A. in terms B. in honor C. in turn D. in return
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