You have to wear a helmet and a life jacket for protection, just ___ you fall into the water.
A. in case C. unless
C. though D. as
34．Hardly_________the phoneI was told that the hotel had been booked full．
| A．I had picked up；when | B．had I picked up；then |
| C．had I picked up；when | D．I had picked up；then |
33．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 |
32. 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 |
31．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 |
30. 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 |