High﹣speed railways have developed rapidly in our country. Today China has high﹣speed rail network(铁路网) among all the countries in the world.( )
A.longB.longer
C.the longerD.the longest
Sam is ____about his speech because he thinks he is well prepared.( )
A.honestB.confidentC.modestD.curious
We've got everything ready for the picnic.
Do you mean I ______bring anything with me?( )
A.can'tB.mustn'tC.couldn'tD.needn't
Could you help me with housework _____you are free today?( )
A.sinceB.thoughC.unlessD.until
_____do your parents take exercise,William?
Less than three times a week.( )
A.How longB.How muchC.How soonD.How often
Tom wants to study at ______university in Europe,but hasn't decided which one to go to yet.( )
A.anB.aC.theD.不填