单项选择题

Without proper lessons, you could________ a lot of bad habits when playing the piano.

A．keep up
B．pick up
C．draw up
D．catch up
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填空题
Many famous people are of _______ origin.
单项选择题
We should always bear in mind that _________ decisions often result in serious consequences.
A．urgent
B．instant
C．prompt
D．hasty
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