Food safety is one of the problems now all over the world.
| A．discussed | B．to be discussed |
| C．being discussed | D．having been discussed |
The boys,________had played the whole day long, were tired．
| A．all of what | B．all of which |
| C．all of them | D．all of whom |
Yuan Long ping is ______ university professor．He likes playing _____ violin．
| A．a; the | B．an; / |
| C．a ; a | D．an; a |
―People should stop using their cars and start using public transport.
―______. The roads are too crowded as it is.
| A．All right | B．Exactly |
| C．Go ahead | D．Fine |
―Do you know where David is? I couldn’t find him anywhere.
―Well. He ______ have gone far — his coat’s still here.
| A．needn’t | B．can’t |
| C．mustn’t | D．wouldn’t |
As a physics teacher, Mr. Chen devoted himself to teaching and researching, which earned him a good ______ in his field.
| A．reputation | B．expectation |
| C．impression | D．Knowledge |