The newly-built lab is ______ the old one.
| A．three times so big as | B．as three times big as |
| C．three times bigger than | D．three times the size |
Not having worked out the problem, ______ leave the office.
| A．so he was not allowed to | B．and he didn’t want to |
| C．the teacher couldn’t make him | D．he couldn’t free himself to |
Nowadays, many people walk to work______ Copenhagen Conference calling for living a low—carbon lifestyle to cope with global warming.
| A．in relation to | B．in response to | C．in addition to | D．in opposition to |
The traffic slowed down because of the heavy snow in Yushu County, presenting a new ____ to the recovery from the earthquake．
| A．suffering | B．disaster | C．damage | D．challenge |
Don’t be so discouraged. If you _______ such feeling, you will do better next time.
| A．carry on | B．get back | C．stick to | D．put away |
Almost everyone has his own strengths and weaknesses. It is ________ others are weak that maybe you have a great advantage.
| A．as | B．where | C．that | D．what |