－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
— 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
Mary together with her sisters, ________Chinese in China.
A.are studying B.have studied C.study D.studies
Which of following belongs to clean energy?
A.CO2 B.H2 C.coal D.N2
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
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
