. —Who____ it be that is knocking at the door?
—It ____ be Father, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
They often go to the restaurants for meals. They _____ be very poor.
| A．mustn’t | B．can’t | C．may not | D．needn’t |
“Shall we go shopping？” “Sorry, we _______ buy anything now because none of the shops are open.”
| A．mustn’t | B．needn’t | C．can’t | D．shouldn’t |
I _______ have met him a long time ago. Both his name and face are very familiar.
| A．may | B．can | C．would | D．should |
Are you still here？ You ______ home hours ago.
| A．should go | B．should have gone |
| C．might go | D．may have gone |
As she’s not here, I suppose she _____ home.
| A．must go | B．must have gone |
| C．might go | D．might be going |