I don’t know _________.
| A．what to do it | B．how to do | C．what to do | D．to do what |
A young man ___ John __________ school recently.
| A．calling; has left | B．called; will leave |
| C．calling; is leaving | D．called; has left |
---Would you mind my opening the window? --- _____ I also feel hot.
| A．Of course not | B．Yes, I do | C．No, I wouldn’t | D．Certainly. |
Stamps ______ sending letters.
| A．used to | B．are used to | C．are used for | D．are using |
We ______ to close the windows before we left the lab.
| A．tell | B．told | C．are told | D．were told |
Xiao Li _________ his hometown for ten years．
| A．has left | B．1eft | C．has been away from | D．went away from |