单项选择题

I don’t ______ when I heard from him.

A. remember
B. learn by heart
C. keep in mind
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When my grandpa became ill, my father ______ the doctor at once.
A. sent for
B. asked for
C. looked for
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Don’t leave the room until you’re ______, Peter!
A. told
B. told to
C. told to do
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