What do you think of his performance?—________indeed. I never met so young a boy with such great skills.[ ]

How many more decades will have to pass ____ scientists succeed in providing a cure for cancer?

frescue workers were working around theclock,supplies to Yushu, Qinghai province after the earthquake

His sudden __________ from the party made all of us .

They are living with their parents for the moment because their own house ____. [ ]