Most of the professors _____ to our school were from South Africa．
| A．invited | B．to be invited | C．being invited | D．had been invited |
He found them at a table chess.
| A．sat; to play | B．sitting; to play | C．seated; playing | D．seat; playing |
Although she has a lot of problems, she managed to remain .
| A．optimistic | B．cautious | C．concert | D．anxious |
The old professor told us that every part of the materials should be made use of _________the station.
| A．building | B．to build | C．build | D． being build |
-----Can i pay the bill by check?
------Sorry, sir. But it is the management rules of our hotel that payment _________ be made in cash.
| A．shall | B．can | C．will | D．may |
To deal with the global financial crisis, China has a string of forceful measures over the past months.
| A．worked out | B．found out | C．turned out | D．made out |