---Look! The light is still on. Is Mr Wu working in his office？
---No, it _____ be Mr Wu. He has gone to Nanjing for a meeting.
| A．needn’t | B．mustn’t |
| C．can’t | D．wouldn’t |
—_______ I borrow your English book? —Yes, of course you _______.
| A．Could; could | B．Must; can |
| C．Could; can | D．Can; could |
Do you prefer _______?
| A．skate | B．skates | C．skating | D．skated |
—Mr. Hu, can you tell us how to learn swimming well?
—Sure. But remember we can learn nothing well _______ hard work.
| A．with | B．after | C．without | D．at |
You _______ wash your hands before meals. It is good for your health.
| A．may | B．can | C．have to | D．must |
It’s hot here. Please keep the windows _______.
| A．closing | B．open | C．closed | D．opened |