________Lily is only five years old,________she can swim very well.( )
A.Though; butB.Because; so
C.Though;/
The school sports meeting will be_______ because of the heavy rain.( )
A.put upB.put onC.put off
If more people give up driving cars,the air will get much _______ in a few days.( )
A.cleanB.cleaner
C.the cleanest
The number of people in the city ______ about seven million now.( )
A.areB.hasC.is
It's necessary for you _______the classroom clean,class.( )
A.keepB.keepingC.to keep
I didn't realize he was a famous scientist ______ you told me.( )
A.untilB.becauseC.since