By the time he retires, professor Baker _____ for almost forty years．
| A．will have taught | B．had taught | C．has taught | D．is teaching |
．The children were warned of not being too _______ about things you are not supposed to know.
| A．strange | B．amusing | C．curious | D．satisfied |
It was difficult to guess what her _____ to the news would be.
| A．impression | B．comment | C．reaction | D．opinion |
Having been attacked by terrorists，________．
| A．doctors came to their rescue | B．the tall building collapsed |
| C．an emergency measure was taken | D．warnings were given to tourists |
We must know what we should do and what we should avoid ______a good impression on others in public place.
| A．to leave | B．leaving | C．to have left | D．leave |
—Well, Kate, I’m sorry, but I have to leave.
---_____. I hope to hear from you soon.
| A．Keep in touch | B．Have s good time |
| C．Walk slowly | D．So am I. |