Thomas Alva Edison didn’t “invent” the light bulb (灯泡), but rather he ______ a 50 –year –old idea, which is not well –known.
| A．improved upon | B．take down | C．put up | D．break away |
No one __________ be more generous; he has a heart of gold.
| A．could |
| B．must |
| C．dare |
| D．need |
-Why are your eyes so red? You __________ have slept well last night.
-Yeah, I stayed up late writing a report.
| A．can't |
| B．mustn't |
| C．needn't |
| D．won't |
Harry is feeling uncomfortable. He __________ too much at the party last night.
| A．could drink |
| B．should drink |
| C．would have drunk |
| D．must have drunk |
When I was a child, I __________ watch TV whenever I wanted to.
| A．should |
| B．could |
| C．must |
| D．need |
Since nobody gave him any help, he __________ have done the research on his own.
| A．can |
| B．must |
| C．would |
| D．need |