---Do you know _____ back tomorrow?
- --Sorry, I don’t know. When he _____ back, I’ll tell you.
| A．when does he come, comes | B．when he comes, will come |
| C．when he will come, comes | D．when will he come, will come |
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 |
Finish your homework first, then you'll surf the Internet for half an hour.
| A．can | B．need |
| C．be able to | D．may |
---Mum, I cut myself just now.
----You ______put some medicine on it.
| A．should | B．need | C．must | D．will |
You ______ be polite to the old man.
| A．should | B．can’t | C．might | D．mustn’t |