A good teacher should encourage his students to ____ the knowledge by themselves instead of just copying and memorizing what the teacher said in class.
| A．expand | B．observe | C．digest | D．react |
—I’m really hungry now.
That’s because you have left your lunch __________.
| A．having untouched | B．to be untouched |
| C．untouched | D．being untouched |
— How much do I owe you for this supper?
— _________. It’s nothing.
| A．You are welcome | B．Forget it |
| C．With pleasure | D．That’s all right |
When Marx was in London, he _______ read at the library for hours.
| A．would | B．might | C．could | D．should |
Help! My door shut after me and the eggs _________ in the pan.
| A．have been fried | B．are being fried |
| C．have been fried | D．are frying |
The reason _______ he gave for being late was ________ he overslept this morning．
| A．why; that | B．why; because |
| C．which; that | D．which; because |