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Frank is working late again. This is the first time this week he's had to study late, ______

A. isn't he
B. hasn't it
C. hasn't he
D. isn't it

―The air is full of smoke and people are coughing.
―It will get worse ______ the government does something about the pollution.

A. but
B. unless
C. except
D. if

I hurried ______ I wouldn't be late for class.

A. since
B. so that
C. as if
D. unless

That is ______ he was born.

A. what
B. that
C. where
D. whether