单项选择题

At first, the speaker was referring to the problem of pollution in the country but halfway in her speech, she suddenly ______ to another subject.

A．committed
B．favored
C．switched
D．transmitted
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We must ______ that the experiments are carried out as rigidly as possible.
A．ensure
B．assure
C．insure
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The child was spoiled by his parents who never ______ him anything, so he became more and more demanding.
A．resisted
B．denied
C．rejected
D．opposed
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