单项选择题

Tom tried his best to keep awake, but the performance was so boring that he couldn't help to sleep.

A．dropping off
B．dropping down
C．dropping away
D．dropping out
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单项选择题
Remember to ask for a ______ of quality for these goods; otherwise they will not offer any maintenance.
A．certificate
B．receipt
C．warranty
D．mark
单项选择题
______ emergency when you are in a lift, you can make a phone call for help.
A．In the event of
B．In the course of
C．In accordance with
D．In association with
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