( )1. as a result of the ________ competition among the airlines，travel expenses have been greatly reduced.
a．fierce b．terrible
c．eager d．necessary
( )2. the policemen went into action ________ they heard the alarm.
a．suddenly b．hurriedly
c．quickly d．immediately
( )3.—would you like to go to the concert with me，mary?
—i have got no interest in it；________，i have lots of homework to do.
a．otherwise b．besides
c．however d．therefore
( )4. it’s known to all that unless you take ________ exercise you won’t keep good资源难易程度:★★★★★★★★★★★★★★★
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