21.Bob got seriously injured in the traffic accident, but luckily, the doctor came __________to save his life.
| A．in time | B．on time | C．at times | D．at last |
It was not until one night_____we were doing our cleaning-upI got curious and wanted to see what was on the top floor．
| A．that；that | B．when；so | C．that；because | D．when；that |
一William has asked me to lend him five pounds．Should I do him the favor and lend it to him?
—Certainly，otherwise he________to borrow it from me．
| A．would try | B．should have tried | C．would have tried | D．had tried |
The elderly clerk showed us several beautiful dresses in my size and price range，hut___________ were right for me．and we were ready to leave．
| A．nothing | B．anything | C．none | D．they |
According to the report，China's graduates will find it tougher than ever to get jobs in the coming year, as China’s economy_________and unemployment rises．
| A．breaks down | B．slows down | C．picks up | D．takes up |
Studies show that the things that contribute most to a______of happiness cannot be bought．
| A．cause | B．thought | C．suggestion | D．sense |