15. The Great Walls of China ____________ thousands of years ago.

A. is built                B. was built                C. is building                D. was building

16. He ____________ more confident since he joined the club.

A. is becoming                B. becomes                C. has become                D. become

17. He visited his grandmother yesterday, ____________?

A. didn’t he                B. hasn’t he                C. isn’t he                D. doesn’t he

18. We have English class ____________ Mondays and Tuesdays.

A. in                         B. on                         C. at                         D. from

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