Last Sunday，a group of pupils talked happily __a loud voice as they went to the countryside bike．（ ）
A．by； byB．in； onC．in； by
Kate， I' m going shopping． Anything to buy for you？
Yes， that will save me a_____．（ ）
A．handB．tripC．visitD．bill
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