单项选择题

A．gap
B．opening
C．distance
D．crack
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单项选择题
A．It’s noisy outside.B．The air is quite fresh inside.C．The air is heavily polluted outside.D．The man should have the air conditioner on.
A．It’s noisy outside.
B．The air is quite fresh inside.
C．The air is heavily polluted outside.
D．The man should have the air conditioner on.
单项选择题
A．WhileB．SinceC．BecauseD．Once
A．While
B．Since
C．Because
D．Once
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