根据首字母及汉语提示拼写单词 (共10小题；每小题1分，满分10分)
Sheep p_____ us with wool.
With his classmates ,he felt a sense of b_____.
It was his carelessness that r_____ in the accident.
I m_____ to help him; unexpectedly I have brought him trouble.
The bus driver is r_____for the passengers’ safety.
You had to be ready for any _____ (紧急事件).
The_____ (有经验的) teacher is used to keeping his students at hard work.
He is such an_____ (高效的)English learner that he often gets the highest mark in each exam.
_____ (冒险)is the salt of life to some people.
Please tell me some opinions on_____ (多样的)social problems.