10. Many U.S automobiles ……………… in Detroit, Michigan.
A. manufacture B. have manufactured
C. are manufactured D. are manufacturing
11. When I came, an experiment ……………… in the lab.
A. was being holding B. has been held
C. was being held D. has held
12. Last night a tornado swept through Rockvill. It …………. everything in its path.
A. destroyed B. was destroyed
C. was being destroyed D. had been destroyed
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