单项选择题

(It is) (extremely) important (for) an engineer (to know) to use a computer.

A．It is
B．extremely
C．for
D．to know
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单项选择题
There are two kinds of computers (there), both (of them) are (widely) (used) today.
A．there
B．of them
C．widely
D．used
单项选择题
If you read the book a (second time), (and you) will probably have (quite a different) understanding of the events (described) in it.
A．second time
B．and you
C．quite a different
D．described
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