________(14)




A.could
B.can
C.cans
D.coulds

Rewrite the following sentences that keep the same meaning.
She didn't say a word as she left the room.




A.She left the room but no saying a word .
B.She left the room however not saying a word .
C.She left the room except for saying a word .
D.She left the room without saying a word .

He sat there with his arms __________doing nothing, waiting for us.




A.flapped
B.folded
C.turned
D.twisted

__________calculations have shown that the earth’s resources may run out before the end of the next century.




A.Raw
B.Blunt
C.Rude
D.Crude

Helium is not inflammable, __________therefore safer than hydrogen.




A.that is
B.and is
C.but is
D.and it

A.summertime
B.vigorous
C.consensus
D.populate

A.merchandise
B.prosperous
C.tolerant
D.musician

______(79)




A.charge
B.payment
C.expensive
D.cost

______(72)




A.invent
B.discover
C.establish
D.modernize

Not until I was on my way to the airport that I realized I had left my passport at home.




A.Not until
B.on my way
C.that I realized
D.at home.