One _______ fact is _______ Crystal always keeps a toothbrush in his pocket for good luck when he is the host of the Academy Awards.
| A．little-knowing ; 不填 | B．well-known ; which |
| C．little-known ; what | D．little-known ; that |
29. The moment we heard of the accident, we____the work to rescue those trapped in the mine.
| A．set off | B．set down | C．set back | D．set about |
28. You can’t complain of being lonely____you don’t make any effort to communicate with others.
| A．when | B．until | C．unless | D．Once |
27. The boy was busy doing his homework, only_____once in a while to look out of the window.
| A．stopping | B．to stop | C．stopped | D．having stopped |
26. You will be at a(n)_____if you have thought about the interview questions in advance in application for a job.
| A．favor | B．advantage | C．benefit | D．profit |
25. Life insurance is not really betting although it can be compared to it.You pay the money just _______.
| A．in time | B．in case | C．in return | D．in honor |