The silence of the library is sometimes broken by a sudden cough or the sound of pages .
| A．turning | B．turned | C．being turned | D．having turned |
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 |
—I saw Dave in the lift this morning.
—Really? He _______ around here for a long time.
| A．won’t be seen | B．wasn't seen | C．hasn't been seen | D．hadn’t been seen |