The air in Beijing is getting much ______ now than a few years ago.
A. clean B. cleaner C. cleanest D. the cleanest
He has two pets. One is a dog, ______ is a cat.
A. the other B. other C. others D. another
— Will you stay for lunch?
— Sorry, I ______. My brother is coming to see me.
A. needn’t B. can’t C. shouldn’t D. mustn’ t
I phoned you at six yesterday evening, ______ nobody answered.
A. because B. or C. but D. so
— ________ did you last see him?
— Two weeks ago.
A. How B. Where C. What D. When
There ______ little water in the river.
A. be B. am C. is D. are
