★ TOEFL
______________provided a living for nearly 90 percent of the population of the American colonies.
A. Farming was what
B. What farming
C. Farming was
D. What was farming
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_____________a tornado spins in a counterclockwise direction in the northern hemisphere, it spins in the opposite direction in the southern hemisphere.
A. However
B. Because of
C. Although
D. That
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