[ Grammar ]
Supply and demand have a direct ____ on the prices of commodities.
A. effect
B. affect
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Grammar › ViewElephants run ………………… of them all.
A. less quickly
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Once upon a time, I walked across _____ very high bridge.
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Grammar › View
Which sentence uses present continuous?.
A. Solving the puzzle took about an hour.
B. We solved the puzzle for an hour.
C. We were trying to solve the puzzle for an hour.
D. The puzzle solved for an hour.