—Sorry, I made a mistake again．
—_____．Practice more and you’ll succeed．
| A．Never mind | B．Certainly not |
| C．Not at all | D．Don't mention it |
I just can’t understand ______ that makes so many young people addicted to playing online games.
| A．what it is | B．what is it | C．why it is | D．why is it |
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 |