3. _______flying is more expensive than land and sea travel, I went there by air to save time.
| A．If | B．As | C．Even though | D．In case |
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 |
The building ________ will be used as our new library.
| A．is being constructed | B．built | C．under construction | D．to build |
The medicine has a strong side ________ on our health though it works well.
| A．influence | B．effect | C．affect | D．impact |