— Has Mary finished writing her article?
— No, and it _____ before class was over.
| A．should be finished | B．should finish |
| C．ought to have been finished | D．should have finished |
Don’t be in a hurry. We are supposed ____________ this problem step by step.
| A．solving | B．to solving | C．to solve | D．solve |
_________you have a rich knowledge of Chinese history, try acting as a guide for these foreign visitors.
| A．Unless | B．Though | C．Now that | D．Ever since |
The school ______ my sister studies at is far from here.
| A．where | B．that | C．at which | D．in which |
You will succeed in the end _____________ you give up halfway.
| A．if | B．unless | C．now that | D．Until |
I couldn’t do my homework with all that noise ___________ outside.
| A．going on | B．goes on | C．went on | D．to go on |