( )1. he letter he had been looking forward to ________ at last.
A.arriving B.arrive C.arrived D.being arrived
( )2. Air pollution often _______ diseases.
A.brings on B.brings up C.brings out D.brings down
( )3. ________ down the radio, the bady is asleep in the next room.
A.Turning B.To turn C.Turned D.Turn