The greenhouse effect occurs _________ heat radiating from the sun.
A.when does the Earth's atmostphere trap
B.when the Earth's atmostphere traps
C.does the Earth's atmostphere trap
D.the Earth's atmostphere traps

If it hadn't been for his carelessness, we would have finished the work on time.
A.He was careless because he hadn't finished the work on time.
B.Had he been more careful, we would have completed the work on time.
C.If he were more careful, we would finish the work on time.
D.Because he was careful, we finished the work on time.

You look exhausted. Why don't we ______ and have a good rest?
A.call its name
B.call on
C.call off
D.call it a day

_________ in scope, romanticism was a reaction against neoclassical principles.
A.Mainly literary
B.The main literature was
C.It was mainly literary
D.The literature was mainly.

Experiments _________ represent a giant step into the medicine of the future.
A.using gene therapy
B.they use
C.use gene therapy
D.gene therapy uses

This one is prettier, but it costs ____ as the other one.
A.twice as many
B.as many as
C.twice as much
D.as much as

Could we picnic here?" "______"
A.No, you may not.
B.I'm afraid so.
C.Not, I think.
D.I'm sorry. I'm afraid you can't.

She asked Janet to repeat what she had said.
A."Will you please repeat what Janet said?", she asked.
B."Please repeat what Janet had said.", she asked.
C."Please repeat what you say, Janet.", she said.
D."Please repeat what you said, Janet." , she said

We can't sign this contract because we have got _________ information about the partner to base on.
A.too few
B.so many
C.so little
D.too little

America, as well as Japan, England, and Germany_______.
A.are developed countries
B.are developing countries
C.is a developed country
D.is developing countries