____ of the students in our class _____ girls.
| A．Three fives, is | B．Three fifths, is |
| C．Three fifth, are | D．Three fifths, are |
— Must I finish my homework now?
— No, you ________. You can go home now.
| A．needn’t | B．mustn’t |
| C．shouldn’t | D．can’t |
-- Must I return the book this week?
-- No, you ______. You can _____ it for 20 days.
| A．mustn’t; keep | B．don’t have to; borrow |
| C．needn’t; keep | D．mustn’t; lend |
I like this room. You ______ see the mountains from the window.
| A．can | B．should | C．must | D．need |
I'm very glad I have my own room in my house. I ______ do what I want in it.
| A．must | B．have to |
| C．need | D．can |
--- Mum, could I play with my classmates for a while after I finish my homework?
--- _______. But you must come back before supper.
| A．Yes, you can | B．Yes, you could |
| C．No, you can't | D．No, you couldn't |