—You see, I’m poor in physics and you are not good at chemistry, and……
— That’s _______ we should help each other.
A. when B where C. how D. what
— 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 |
－Is there a fog in the evening?
－There ______ be. I’ll make a phone call to find it out.
| A．must | B．would | C．will | D．might |
－The door was open.
－It ______ open. I had locked it myself and the key was in my pocket.
| A．can not be | B．must not be | C．can not have been | D．must not have been |