Test takers _______ remain in their seats until all the exam papers have been collected.
| A．can | B．could |
| C．shall | D．would |
After hours of repair,the driver tried to start the car but it _______ work.
| A．won.t | B．shouldn’t |
| C．wouldn.t | D．couldn’t |
—Daddy, would you buy me an MP3 player if I do well in the first city-wide examination?
—I _______, I promise.
| A．would | B．shall |
| C．will | D．do |
I _______ have been more than six years old when the accident happened.
| A．shouldn’t | B．couldn’t |
| C．mustn’t | D．needn’t |
—Why does Sara know so much about Angkor Wat?
—She _______ there,or she may have read about it.
| A．must have been |
| B．shouldn’t have been |
| C．may have been |
| D．can’t have been |
