．—I did not know you were good friends．
—You___．I have known her since she moved here．You were abroad then．
| A．may have | B．needn’t have | C．couldn’t have | D．must have |
If I take this medicine twice a day, it should _______ my cold.
| A．heat | B．cure | C．treat | D．help |
The children ran away from the orchard(果园)________ they saw the guard.
| A．for the moment | B．by the moment | C．the moment | D．at the moment |
In China, the education is divided into three _______: basic education, higher education and adult education.
| A．scores | B．categories | C．degrees | D．trends |
By the time he was twelve, Edison _______ to make a living by himself.
| A．has begun | B．began | C．had begun | D．had been beginning |
The two sportsmen congratulated each other _______ winning the match by shaking hands.
| A．with | B．on | C．in | D．to |