.The traffic slowed down because of the heavy snow in Yushu county, presenting a new __________ to the recovery from the earthquake.

It is a pity that none of the ______ stopped ______ the poor man lying there, begging. 

It is a great______for a person to be able to drive when he is seeking a job.

The heroic story that the university student had saved a peasant’s life hit the ________ in China Youth Daily.

To make members of a team perform better, the trainer first of all has to know their _____ and weakness.