____ regular exercise is very important, it’s never a good idea to exercise too close to bedtime.
A．It B．As
C．Although D．Unless
He was a good student and scored _________ average in most subjects.
A．below B．of
C．on D．above
Nick, it’s good for you to read some books ______China before you start your trip there.
A．in B．for
C．of D．on
I always wanted to do the job which I’d been trained ______.
A．on B．for
C．by D．of
Graduation is a good time to thank those who have helped you ______ the tough years.
A．through B．up
C．with D．from
With new technology, pictures of underwater valleys can be taken ______ color.
A．by B．for
C．with D．in
