Look, the trees are fallen. There ________a strong wind.
A. must be
B. should have been
C. must have been
D. could be
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These two pictures are almost (identify) ________ with each other.
It is (legal) ________ to steal things.
Jack used to (imitate) ________ monkeys to make others laugh.
It is very important that enough money (collect) ________ to fund the project.
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