While he was investigating ways to improve the telescope, Newton made ____ discovery which completely changed ________ man’s understanding of color.
| A．a ; / | B．a ; the | C．/ ; the | D．the ; a |
If you leave the club ,you will not be ______back in .
| A．received | B．admitted | C．turned | D．moved |
____ a letter from her parents, Lily is now looking forward to ___ from them.
A Having not received; hear B. Not received; hear
C. Not having received; hearing D. Receiving not; hearing
I can’t imagine_____ that with such a famous author.
| A．work | B．to work | C．to be working | D．working |
---You were brave enough to raise objections at the meeting.
---Well, now I regret ____ that.
A. to do b. to be doing C. to have done D. having done
Unless ___ to speak，you should remain silent at the conference．
| A．invited | B．inviting | C．being invited | D．having invited |