单项选择题

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

A．It is
B．for
C．to know
D．to use a computer
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单项选择题
We (strongly) suggest (that) Smith (is told) about (his) physical condition as soon as possible.
A．strongly
B．that
C．is told
D．his
单项选择题
Of the two lectures, (the first) was by far (the best) one, partly because the person who delivered (it) had (such a) pleasant voice.
A．the first
B．the best
C．it
D．such a
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