____ each other for years, they talked almost the whole night and had a wonderful time.
| A．Not having seen | B．Having not seen | C．Not seen | D．Not to see |
We’re very annoyed ____his mistake, because we have emphasized this for several times.
| A．with | B．at | C．on | D．to |
The world will be different from what it is now, and we will have to be prepared to ____to the change.
| A．adapt | B．adopt | C．apply | D．devote |
---Mike, our team will play against the Rockets this weekend. I’m sure we will win.
---________!
| A．Congratulations | B．Cheer up |
| C．Best wishes | D．Good luck |
I don't think the experiment is ___ failure, because it has provided us with ___valuable experience for our future tests．
| A．不填; 不填 | B．不填; a | C．a; 不填 | D．a; a |
As is known to us all, under no circumstances______ temporary economic development at the expense of the environment and resources.
| A．should we seek | B．we should seek |
| C．we had sought | D．had we sought |