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第1题

__________ how to operate a switchboard, I had to ask the office supervisor to show me the correct procedures.
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第2题

His _______ change very quickly; one moment he is cheerful, and the next he's complaining about everything.
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第3题

That matter is so _______ that it must not be discussed outside this office.
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第4题

I will _________ you some favor.
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