—Whose purple coat is this?
—It ____ be Lily’s. Hers is red. It _____ be Lucy’s. She likes purple.
| A．must; may | B．may; must |
| C．can’t; may | D．mustn’t; must |
---It’s generous ________ Millie to donate all her pocket money to UNICEF．
---Yes. It is really meaningful _________ us to do something for charities．
| A．of；of | B．for；for |
| C．for；of | D．of；for |
---It’s nice day, isn’t it?
---Yes, what fine weather!
| A．a; a | B．the; the |
| C．a; / | D．the; / |
The windows of classroom _____ up every week.
| A．is cleaned | B．was cleaned |
| C．were cleaned | D．are cleaned |
I really don’t know _______
| A．how to do | B．what to do it |
| C．how to do it | D．which to do it |
Students are often told _____ at people who are in trouble.
| A．not to smile | B．to smile |
| C．not to laugh | D．to laugh |