________knowledge a man has，________it is for him to get a good job.
A．The more; more difficult B．The more; the easier
C．The more; easier D．The less; more difficult
Many chemical substances react________oxygen.
A．on B．with C．against D．to
The population of China ________ 1.3 billion，and 80% of the population________farmers.
A．are; is B．is; is C．is; are D．are; are
They are quite different ________ each other ________their tastes.
A．from；in B．in; from C．with; on D．with; in
He ________to come at eight, but in fact he never comes before nine.
A．is supposing B．supposes
C．is supposed D．supposed
Mr. Smith is ________a teacher. He is also our good friend.
A．only B．more than
C．no more than D．nor more than
