While he was investigating ways to improve the telescope, Newton made ________ discovery which completely changed ________ man’s understanding of color.
| A．a; 不填 | B．a; the | C．不填; the | D．the; a |
Whenever he was asked why he was late for class, he would answer carelessly, always the same thing.
| A．saying |
| B．said |
| C．to say |
| D．having said |
The old clock needs every day, otherwise it will stop working.
| A．to turn up |
| B．to wind up |
| C．winding up |
| D．wind down |
—I feel so nervous about the coming college entrance examination.
—________. You have been studying very hard.
| A．It’s up to you | B．Take it easy |
| C．You got it | D．I couldn’t agree more |
Our teacher requested all of us _________ late for class.
| A．were not | B．could not be |
| C．might not be | D．not be |
We ____________ here on time. But the traffic was so heavy.
| A．can have come | B．must have come |
| C．should have come | D．need have come |