Mark Twain ______ school and began to work at the age of twelve.
| A．left | B．leaves | C．will leave | D．leave |
－Can you tell me Kitty’s address.
－I don’t know, either. But I’ll tell you her address when she ______ to me.
| A．writes | B．write | C．wrote | D．written |
Mr. and Mrs. Black ______ back _________.
| A．hasn’t come, yet |
| B．haven’t come , yet |
| C．haven’t come， already |
| D．hasn’t come , already |
——The dining room is dirty. Can anyone clean it?
——________ I do it all the time.
| A．Don't mention it. | B．Why you? | C．Not sure | D．Not me again. |
——Would you mind turning down the music?
——_____.
| A．Yes, I would | B．Yes, I do | C．No, of course. | D．No, not at all., |
——Why is the classroom so dirty?
——Sorry, Sir. It _____ yesterday. We forgot to do it.
| A．doesn't clean | B．didn't clean | C．isn't cleaned | D．wasn't cleaned |