( )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
