Professor Smith, along with his assistant, ________on the project day and night to meet the deadline.
| A．work | B．working | C．is working | D．are working |
The train has gone. You two ________ on time.
| A．should come |
| B．must have come |
| C．ought to have come |
| D．shouldn’t have come |
There was plenty of time. She ________ to the station.
| A．mustn’t have hurried |
| B．couldn’t have hurried |
| C．must not hurry |
| D．needn’t have hurried |
Some pirates(海盗)appeared, so they ________ change their route.
| A．must |
| B．should |
| C．have got to |
| D．ought to |
—Must all the passengers in the airbus be foung now?
—No, they ________, because none of them is affected by the flu.
| A．mustn’t |
| B．needn’t |
| C．can’t |
| D．may not |
—Happy birthday!
—Thank you! It’s the best present I _______for.
| A．should have wished |
| B．must have wished |
| C．may have wished |
| D．could have wished |