单项选择题

It is essential that everyone ______ safety procedures in the event of an emergency.

A. follow
B. followed
C. following
D. be followed
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单项选择题
When customer service representatives speak to customers over the phone, they should always speak ______.
A. hardly
B. clearly
C. respectably
D. respectively
单项选择题
Presently, ______ appears that the problem of absenteeism has yet to be adequately addressed.
A. he
B. its
C. his
D. it
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