—There will be a talk show this time tomorrow．Would you go with me?
—I'm sorry, but I ______ an important meeting．
| A．have attended | B．will be attending |
| C．am about to attend | D．will attend |
He always takes full _____ of the mistakes made by his rivals(对手) to win the election.
| A．advantage | B．disadvantage | C．advance | D．adventure |
Some researchers believe that there is no doubt _____ a cure for AIDS will be found.
| A．which | B．that | C．what | D．whether |
Use the umbrella to ______ yoursel
f from the rain.
| A．prevent | B．keep | C．save | D．protect |
____ for a long time, but he managed to catch up with his classmates at last.
| A．Having been ill | B．Being ill | C．He was ill | D．Though ill |
We mustn’t waste anything; ______, we mustn’t waste our time.
| A．after all | B．in all | C．above all | D．at all |