根据下列句子及所给单词的首字母，写出各单词的正确形式（每空限填一词）。As we all know, Nelson Mandela was once s_______________ to 27 years in prison.
On the top of the high mountain, they found the air was hard to b____________.
He is not a Chinese but he can speak Chinese f_____________.
Most scientists present at the meeting voted a_____________ the plan for it would be harmful to the air.
They all b__________ out laughing at the funny joke.
She is so generous that she gives the poor food and clothing and asks for nothing in r________.
After the earthquake, the whole city lay in r__________.
A majority of people like to play o__________ rather than stay indoors when it is fine.
People in all countries hope for a p_____________ world instead of one filled with wars.
We need more e___________ to prove that he is the thief.