The conference has been held to discuss the effects of tourism ______ the wildlife in 
the area.
| A．in | B．on | C．at | D．with |
—1 have warned you of the traffic． You know what to expect around National Day．
—Sorry, we reallythe freeway． Now, we'll spend the holiday on this freeway．
| A．must have avoided | B．should have avoided |
| C．will have avoided | D．can have avoided |
In the age of microblog or Weibo, common people can make their voiceby posting their opinions and attracting public attention．
| A．hearing | B．hear |
| C．heard | D．to hear |
Since three Chinese astronauts piloted Shenzhou IX to link up with Tiangong-l, China's exploration ofouter space has reachednew stage．
| A．不填；a | B．the; a |
| C．a：the | D．不填：不填 |
--Did you like your trip to Xi’an during the Summer vacation?
--____. It was too hot and there was too much traffic.
| A．Not a little | B．Don’t mention it |
| C．Not really | D．Not exactly |
She couldn’t find her sonshe had dropped him off.
| A．when | B．until |
| C．although | D．where |