Plastic bags have caused serious environmental pollution，________?

A．haven’t they     B．have they        C．don’t they         D．do they

The snow storm which hit this area last night was_________ in recent years．

A．heavy         B．heavier           C．heaviest          D．the heaviest

We should leave early tomorrow morning，_________we won’t get there on time．

A．so         B．or          C．but          D．and

Bill won’t make any progress ________he studies harder than before．

A．if                 B．when            C．because           D．unless

George was frightened to see a snake in the grass．His face turned ___________．

A．pale          B．clean              C．sadly              D．happily

After a long journey，the eight pandas from Wolong safely ________in Beijing．

A．arrived       B．reached            C．got          D．come

Look! Jane’s grandmother _________with some aged people in the park．

A．dances          B．danced           C．is dancing              D．was dancing

Kevin __________to work in his hometown after he graduated from university．

A．goes       B．went                  C．will go            D．had gone

一Must l return the Magazine to you right now，Sandy?

一No，you_______．You may keep it until next Wednesday．

A．needn’t       B．can’t           C．must              D．may

Our headmaster asked us ________a report on how to protect wild animals．

A．write         B．writing             C．to write           D．wrote