单项选择题

A primary school teacher can not take it for granted that his pupils always do their homework ______.

A．as follows
B．as required
C．as goes
D．as is well known
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单项选择题
The young chemist is ______ experiments in much the same way that his instructor used to do.
A．reforming
B．conducting
C．prompting
D．participating
单项选择题
The primitive weapon ______ from that country as it could not be traced back to any other origin.
A．must be introduced
B．must have been introduced
C．might be introduced
D．might have been introduced
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