单项选择题

What we must do now（）make a careful investigation on the circumstances.

A. are
B. is
C. is to
D. were to

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The letters PTO （）parent-teacher organization.

A. stand for
B. call for
C. head for
D. care for
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The president（）Mr. Baker medical adviser.

A. promised
B. praised
C. imagined
D. appointed
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