In ancient China, horses are often ___ good luck .
| A．connected to | B．consisted of |
| C．competed with | D．communicated with |
Air pollution has become__________ than ever before. We must do something to stop it.
| A．serious | B．more serious |
| C．most serious | D．the most serious |
Old Mr. Black lives happily with his three dogs.of them are part of his family.
| A．Both | B．All |
| C．None | D．Neither |
—can you finish the report on food safety?
— In two days.
| A．How far | B．How much |
| C．How often | D．How soon |
The traffic is moving very slowly as so many carson their way back to Shanghai.
| A．am | B．is |
| C．are | D．be |
Students are encouraged to share their learning experience__________ their classmates.
| A．to | B．in |
| C．at | D．with |