--Do you know when the Chinese custom_________ from?
--It's hard to say. But its characteristics__________ the Tang Period.
| A．began; prove | B．started; show | C．dates; suggest | D．is; appear |
Nothing that you say can change his mind, ________？
| A．do you | B．don't you |
| C．can it | D．can't it |
The smoggy weather has made us realize ________ terrible problems we are faced with.
| A．how | B．what |
| C．that | D．which |
—How unhappy your roommate looks!
—Yes, but he's not willing to tell me what it is ________ is troubling him.
| A．what | B．which |
| C．as | D．that |
When the millionaire was young, he was very poor. Only by doing parttime jobs during the summer holiday ________ afford to pay his college fees.
| A．he could | B．could he |
| C．can he | D．he can |
So quickly ________ is a possibility today may be a reality tomorrow.
| A．are science and technology advancing that |
| B．science and technology advancing are that |
| C．science and technology are advancing what that |
| D．are science and technology advancing that what |