The students，__________ at the way the questions were put, didn't know the answers to them.
| A．they being surprised | B．surprised |
| C．their being surprised | D．them surprised |
He was diagnosed with cancer last month, but he carried on with his work ______ nothing had happened.
| A．even thought | B．as if | C．so that | D．in case |
--- It is strange that he ______ come so late.
--- Something unexpected must have happened to him.
| A．should | B．could | C．must | D．might |
The farmers were busy getting in the rice in the field, only ______ for a drink once in a while.
| A．to stop | B．stopping | C．to have stopped | D．having stopped |
Pierre Curie ______ his own research work and joined Madam Curie in the search for radium.
| A．turned down | B．gave off | C．set aside | D．took over |
The young man is ______ Edison in our factory and he has made ______ number of important inventions over the years.
| A．an; the | B．an; a | C．\; the | D．\; a |