Children must _______ road safety before they are allowed to ride a bike on the road.
| A．instruct in | B．instruct | C．be instructed in | D．be instructed |
The old professor, to_______ the important invention _______, decided not to keep it for himself, but to make it known to all over the world.
| A．whom; was belonged | B．which; belonged |
| C．whom; belonged | D．which; was belonged |
It remains ______ whether Liu Xiang will take part in the next Olympics.
| A．to see | B．to be seen | C．seeing | D．to have seen |
I don’t think the problem you referred to is worth______.
| A．thinking | B．being thought over |
| C．thinking over | D．considering of |
---I’m taking part in the 200-meter race tomorrow. ---_________.
| A．Nothing at all | B．congratulations | C．No problem | D．Good luck |
—Why didn’t you tell him about the exciting news?
—He rushed out of the room ______ I could say a word.
| A．before | B．after | C．when | D．until |