单项选择题

Babies often ______ down when they are learning to walk.

A．drop
B．fall
C．slip
D．jump
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单项选择题
He is very ______ in using money.
A．economic
B．economical
C．economy
D．economize
单项选择题
She ______ the washing out in the garden because it was fine yesterday.
A．hung
B．hang
C．hanged
D．hanging
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