Who is ______ of the three young men?
A. cleverB. clevererC. cleverestD. the cleverest
--You don’t look ______ today. What’s wrong?
--It’s the bad fever.
A. wellB. happilyC. hardD. strongly
Sometimes parents find ______ hard to communicate with their children.
A. thisB. thatC. itD. one
Nowadays scientists are working hard to find out ______ to do with air pollution.
A. howB. whyC. whenD. what
Good teachers can usually give the students______ advice on their study.
A. a great manyB. huge amounts of
C. a large number of D. too many
Chinese people have been using paper for over______ years.
A. thousandsB. two thousandC. thousands of D. thousand
