单项选择题

The teacher didn't begin the class ______ all the students_______.

A．until, stopped to talk
B．before, stopped talking
C．while, stopped to talk
D．because, stopped talking
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单项选择题
You must make______clear that we are not affected by these changes.
A．that
B．this
C．it
D．/
单项选择题
The hole in the wall is large enough for a bird to fly through without touching ______.
A．either wing
B．each of their wings
C．any wing
D．both of the wings
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