_____, the population of China is the largest in the world.
| A．It is known that | B．As is well known |
| C．Which is well known | D．We all know that |
In the current situation, ___________ the dollar goes above 1.85 reais, investors sell the greenback to take some profit.
| A．whenever | B．however | C．whatever | D．whichever |
Thanks to Mr. Smith the father and the son eventually______________ after ten years' cold relationship between them.
| A．took up | B．made up | C．looked up | D．turned up |
—A medical team was sent to Japan by air five hours ago.
—So they ______________ have arrived by now. The flight usually takes four hours or so.
| A．might | B．could | C．must | D．need |
He got wellprepared for the job interview, for he couldn't risk the good opportunity_______.
| A．to lose | B．losing | C．to be lost | D．being lost |
________ there is going to be a policy change ________ of those things is going to change.
| A．Unless; few | B．Until; few | C．Unless; none | D．Until; none |