Every possible means ___ to prevent the air pollution, but the sky is still not clear．
| A．is used | B．are used | C．has been used | D．have been used |
---I’m sorry. That wasn’t of much help.
---_____. And it was most helpful.
| A．Thanks anyway. | B．It doesn’t matter. | C．Of course not. | D．Sure it was. |
---Excuse me, I want to buy some stamps. Where can I find a post office?
---I know _____ not far from here. You can easily find _____.
| A．that; it | B．it; one | C．one; it | D．it; that |
In the south of the city ______ two railway lines.
| A．is | B．are | C．have | D．has |
The head teacher with his students ______ Zhang Gong Shan Park if it _____ tomorrow.
| A．is going to; isn’t rainy | B．are going to; isn’t raining |
| C．is going to; won’t rain | D．are going to; doesn’t rain |
---What are you reading, Tom?
--- I’m not really reading, just _____ the pages.
| A．turning off | B．turning around | C．turning over | D．turning up |