When it______ air pollution, Beijing faces the three “C” s-----cars，coal and construction，which lead to Beijing's thick air pollution.
| A．refers to | B．comes to | C．happens to | D．speaks to |
.
There are many more advantages of buses______cars.
| A．for | B．to | C．over | D．with |
.
---How can you_____them_____the solar cars?
---Solar cars are getting better all the time.
| A．persuade,to use | B．persuade,into using | C．persuade,in using | D．persuade,for using |
.
Camp Xtreme is the biggest adventure camp in Scotland and has 15_____staff.
| A．good training | B．good trained | C．well trained | D．well training |
.
Marco______his tales though few people at that time believed it to be true.
| A．stood up | B．stood by | C．stood on | D．stood to |
.
Marco found the walls of the Summer Palace were covered______gold and silver and the Hall was so large it could easily______6,000 people for dinner.
| A．with,seated | B．in,seated | C．in,seat | D．with,be seated |