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.

By being absent so often Paul failed the examination.




A.Being absent so often caused Paul fail his examination.
B.Paul failed his examination although he was absent quite often.
C.Paul's failure in his examination accounted for his frequent absences.
D.Paul's frequent absences cost him his chance of passing the examination.