What a pity. Considering his ability and experience, hebetter.
| A． | need have done | B． | must have done |
| C． | can have done | D． | might have done |
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 |