单项选择题

Don't ask other people's advice ______ you intend to act on it.

A、therefore
B、unless
C、however
D、expect
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Many mothers have difficulty ______ the demands of their baby.tellB、tellingC、being toldD、to be told
A、to
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He ______ that in 1989, the multimedia market place was worth $4.7 billion.
A、occurred
B、demanded
C、estimated
D、threatened
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