用括号内所给动词的适当形式填空。
There was a loud noise while Lily _______________ (listen) to music in her study.
It is very important ________________ (not give) your goldfish too much food.
Look! The audience __________________ (clap) their hands at the theatre .
---_________ you_________  (hear) from him recently？   --- Not yet.
Listen! The radio says something bad ______________ (happen) last night.
The parade was so wonderful that all of us couldn’t stop _____________ (take) photos.
There ________________ (be) a class meeting this afternoon, isn’t there?
Computers __________________ (control) by programs .
The hot water must _________________ (keep) away from the children .
_________________ （not throw）litter everywhere, children.