We should ______ the books after you read them. Don't throw them everywhere.

A.put away B.put off C.put up D.put out

If we _______ take environment problems seriously , the earth ______worse and worse.

A.don’t ; won’t be B.won’t be ; isn’t

C.won’t ; is D.don’t ; will be

Which of following belongs to clean energy?

A.CO2 B.H2 C.coal D.N2

Mary together with her sisters, ________Chinese in China.

A.are studying B.have studied C.study D.studies

— Did you notice . in her office?

— Yes. She was going over our writing.

A.what was Miss Lin doing B.what Miss Lin was doing

C.what does Miss Lin do D.what Miss Lin does

－The traffic is very heavy, so Mike ________ come late.

－That's OK. We'll wait for him.

A.can B.may C.need D.should

— Driving less and walking more is good for our health.

— So I’d rather ________ an hour’s walk to work than consider ________ a car.

A.take ;drive B.take ; to drive C.take; driving D.taking; driving

—Why are you worried?

—I’m expecting a call from my daughter. She New York for three days.

A. has gone to B. has been to

C. has been in D. has come in

My mother told the visitors _______ walk quietly and _______ wake the baby up.

A.to; to B.not to; not to

C.not to; to D.to; not to

The teachers hope all of us can hand _______ our homework _______ time every day.

A.up; in B.out; on C.on; in D.in; on