单项选择题

(By reading) the directions (carefully), some mistakes (in the exam) could (have been) avoided.

A．By reading
B．carefully
C．in the exam
D．have been
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On her (way to) the supermarket yesterday morning, Mary (met) an old friend and stopped talking with him (for) quite a while.
A．way to
B．met
C．stopped talking
D．for
单项选择题
There (are) two kinds of (computers) in this country, both of (them) are widely (used) today.
A．are
B．computers
C．them
D．used
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