16. The government has to close those small factories to prevent t he water of the river ______.
A. polluting B. from polluting C. being polluted D. polluted
17. ______ anyone should want to kill her was unbelievable.
A. Whether B. That C. What D. If
18. ______ the ancient Egyptians built the pyramids puzzled people for centuries.
A. Whether B. What C. How D. Where
19. Word came ________ China's second manned spacecraft Shenzhou VI blasted off into the sky Wednesday morning October 12, 2005.
A. which B. that C. / D. what
20. They live in a beautiful village, with many trees and flowers ________ it.
A. surrounded B. surrounds C. surrounding D. to surround
21. In summer, the temperature here sometimes__________ as high as 39℃.
A. rises B. rising C. raising D . raises
22. No potatoes for me—I’m _______ a diet.
A.at B.in C.on D.with
