Mr. Black comes from England, and he has stayed in China for three years. So you can talk with him ________.
| A．either in English or in Chinese | B．not in Chinese but in English |
| C．just in English not in Chinese | D．neither in Chinese nor in English |
It is difficult for us to learn a lesson in life _______ we've actually had that lesson.
| A．when | B．after | C．since | D．until |
One fifth of the work _______ by computer last year.
| A．are done | B．is done | C．were done | D．was done |
This is the very thing ______ belongs _____.
| A．which; her | B．that; her | C．which; to hers | D．that; to hers |
She kept on _______ until midnight though he was tired.
| A．work | B．worked | C．working | D．to work |