When the teacher came in, the students ______ about the film
| A．are talking | B．were talking |
| C．talked | D．talks |
— Look at the boy playing basketball on the ground. Is it George?
— It ________ be him. He told me he would play basketball after class, but he’s not sure.
| A．mustn’t | B．must | C．can’t | D．may |
–Look! A man is cutting a tree on the moon.
--It ______ be true. The teacher said there is no air on the moon.
| A．can’t | B．may not |
| C．shouldn’t | D．mustn’t |
----Must I finish the work today, Mom?
----No, you _______________. You can finish it tomorrow.
| A．mustn’t | B．can’t |
| C．needn’t | D．shouldn’t |
—May I take photos in the museum?
—No, you . You obey the rules here.
| A．may not; can | B．mustn’t; may |
| C．can’t; can | D．mustn’t; must |
—who is the man over there ? Is it Mr.Wang ?
—No, it _____be him .Mr.Wang is much fatter.
| A．can’t | B．need |
| C．mustn’t | D．may |