It is believed that a new kind of drug _____ by the scientists and they are hopeful that they will succeed in a few months．
| A．has been developed | B．is being developed |
| C．is developing | D．has developed |
It _ __ last night，for the ground was wet this morning.
| A．must have rained | B．may have rained |
| C．must rain | D．might rain |
— Will Mr Wang offer us a hand?
— He ____ be glad to. He never refused our request.
| A．can | B．must | C．may | D．should |
— When can I come for the photos? I need them tomorrow afternoon.
— They ____ be ready by 12：00.
| A．can | B．should | C．might | D．need |
It’s nearly seven o’clock. Jack _____ be here at any moment.
| A．must | B．need | C．should | D．can |
They must have finished the work, ______?
| A．mustn’t they | B．haven’t they | C．hadn’t they | D．didn’t they |