( )16.-I can’t find my CDs. -________you put them in that bag.
A. Must B. May be C. Maybe D. May
( )17.-What about_______ a rest? –OK! Let’s go for a walk.
A to have B. ha d C. have D. having
( )18.--Sally, how often do you use the Internet ?-_________.
A. Twice a week 3. Three hours C. Two years ago D. This afternoon
