We hung a net round the bed, which could protect us _____ mosquitoes and other insects.
| A．from | B．by | C．off | D．under |
I ________ myself more—it was a perfect day.
| A．shouldn’t have enjoyed |
| B．needn’t have enjoyed |
| C．wouldn’t have enjoyed |
| D．couldn’t have enjoyed |
The dooropen , no matter how hard she pushed.
| A．shouldn’t |
| B．couldn't |
| C．wouldn't |
| D．mightn't |
Since nobody gave him any help, he have done the research on his own.
| A．can |
| B．must |
| C．would |
| D．need |
No onebe 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 |