The changes in our chemistry lab will cost quite a lot, ____ they will save us money in the long run.
| A．or | B．since | C．for | D．but |
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 |
Don’t you think it essential that every resident of Nanjing __________ spare no effort to make contributions to Nanjing 2014 Youth Olympic Games?
| A．should | B．will | C．shall | D．would |