---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 |
It is dangerous _______ football on the road.
| A．for us to play | B．of us playing |
| C．for us playing | D．of us to play |