---Did you listen to the lecture given by the famous herbalist doctor Zhang Wuben?
--- No, we ______ it. But we had a lot of traffic on our way.
| A．could have attended | B．must have attended |
| C．could attend | D．shouldn't have attended |
I _____ his telephone number. Had I known it, I would have rung him up.
| A．don’t known | B．didn’t know |
| C．hadn’t known | D．haven’t known |
--- Don’t look down upon Bob. He has his own advantages.
--- Oh, yes. ____ others are weak , he is strong.
| A．When | B．Where | C．While | D．If |
The new machine, as is reported in the local newspaper, will work twice as fast, _____ greatly reducing costs.
| A．thus | B．anyhow | C．yet | D．even |
Last month, part of Southeast Asia was struck by floods, from ___ effects some people are still suffering.
| A．that | B．whose | C．what | D．those |
_____ to try his fortune abroad, he left for America.
| A．Having determined | B．Being determined |
| C．Determined | D．To determine |