15. Jack found an old coin while he _____________ in the garden.

A. is working                B. working                C. was working        D. works

16. The book _____________ I read yesterday was written by Jack London.

A. what                B. which                C. who                        D. when

17. The picture is beautiful, _____________?

A. wasn’t it                B. does it                C. isn’t it                 D. hasn’t it

18. David wishes he _____________ the answer to this question.

A. have known                B. know                C. will know                 D. knew

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