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
It's very kind _______ you ________ me your bike.
A.of; lending B.of; to lend C.for; lending D.for; to lend
－He didn't come to school this morning, did he?
－___________. He was ill.
A.Yes, he did. B.Yes, he didn't. C.No, he did. D.No, he didn't.
