Hello． Is Gina there？
Sorry， she's not home．（ ）
A．toB．atC．onD．of
Must you go？
Yes， I' m afraid I really_____．（ ）
A．mayB．shouldC．mustD．can
Who______the computer？
Sorry， I've no idea． But it has changed the world greatly．（ ）
A．inventedB．discoveredC．madeD．played
We experienced a few moments as we waited to hear the results of the test．（ ）
A．pleasantB．anxious
C．hopefu1D．disappointing
What are you doing？
I'm looking ______ the kids． They should be back for lunch now．（ ）
A．afterB．atC．forD．up
Do you still play basketball？
Oh， no． I ______ it for the past three years．（ ）
A．haven't playedB．didn't play
C．won't playD．hadn't played