Tea was invented __ accident over three thousand years ago. [

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Tea was invented       __  accident over three thousand years ago.          [     ]
A.  by
B.  in
C.  because of
D.  for

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举一反三

The teacher divided the students in his class _____ ten teams.    [     ]
A. in
B. to
C. into
D. at

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When I was waiting for the bus, Tom came           in his father"s car.       [     ]
A. on
B. in
C. to
D. by

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My uncle has worked            the farm            twenty years ago.        [     ]
A. on, for
B. in, for
C. in, since
D. on, since

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There is a bookstore_____the second floor.    [     ]
A. in
B. on
C. at
D. to

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           the end of the match, we had kicked four goals.       [     ]
A. At
B. By
C. In
D. On

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