16. _______ the book again, she discovered that she had missed a lot in her first reading.
A.While reading B. When read
C. As reading D. In reading
17. I decided to buy a car because we had sold ______ we had in England before leaving.
A.that B. the other
C. which D. the one
18. The moon is a world that is completely still and _____ utter silence prevails.
A.that B. where
C. which D. whenever
19. The United States is composed of fifty states, two of ______ are separated from the others by land or water.
A.them B. that
C. which D. those
20. In fact he had done _______ he could to help the poor.
A.what B. which
C. as D. all which
答案:16-20 ADBCA
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