单项选择题

He'll be an astronaut by the time he ______ thirty.

A．is
B．had been
C．will he
D．is going to be
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单项选择题
It's believed that ______ you work, ______ result you'll get.
A．the harder... the better
B．the more hard... the more better
C．the harder... a better
D．more hard ... more better
单项选择题
I need ______ cloth, for I'm going to make ______ clothes.
A．a lot of... many
B．much... much
C．many... many
D．many... a lot of
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