— _________, this math problem seemed quite simple to me, but when I tried to work it out, I just couldn’t.
— There are always things like this, I think.
| A．On one hand | B．In my opinion | C．At first sight | D．On its own |
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 |