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A. as long as B. as

C. while D. now that

A. Class One. B. Class Two. C. Class Three.

A. why B. how

C. what D. whether

—He advised me to live _________ the air is fresher.

A. if B. because C. where D. when

A. whoever B. however

C. whatever D. wherever

A. which B. whom

C. that D. whose

—______ you bought last Sunday? I'm afraid I haven't seen ______.

A. The one; one B. The one; it C. One; it D. That; one

—Yes. But for your advice, we __________ our stay in London half as much.

A. didn’t enjoy B. hadn’t enjoyed

C. wouldn’t enjoy D. wouldn’t have enjoyed

A. because B. when

C. unless D. until

— _____ the naughty children.

A. It is B. They are C. That is D. There are