He was busy writing a story，only _________ once in a while to smoke a cigarette．
| A．to stop | B．stopping |
| C．to have stopped | D．having stopped |
Either you or one of your students______ to attend the meeting that is due tomorrow.
| A．are | B．is | C．have | D．be |
By the time the police came to rescue the old woman, she _______for four days under the house.
| A．buried | B．had buried | C．had been buried | D．has been buried |
Recently I bought an ancient vase, ______ , I think, was quite reasonable.
| A．which price | B．the price of whose |
| C．its price | D．the price of which |
A terrible earthquake and tsunami struck northeastern Japan, _______ almost 28,000 people to be dead or missing.
| A．caused | B．to cause | C．causing | D．having caused |
In some places in Yunnan, women are expected to run society and earn money ______ men work at home and raise their children.
| A．but | B．while | C．because | D．though |