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）。
【小题1】As we all know, Nelson Mandela was once ssentenced to 27 years in prison.
【小题2】On the top of the high mountain, they found the air was hard to bbreathe .
【小题3】He is not a Chinese but he can speak Chinese ffluently .
【小题4】Most scientists present at the meeting voted aagainst the plan for it would be harmful to the air.
【小题5】They all bburst out laughing at the funny joke.
【小题6】She is so generous that she gives the poor food and clothing and asks for nothing in rreturn .
【小题7】After the earthquake, the whole city lay in rruins .
【小题8】A majority of people like to play ooutdoors rather than stay indoors when it is fine.
【小题9】People in all countries hope for a ppeaceful world instead of one filled with wars.
【小题10】We need more eevidence to prove that he is the thief.
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解析：
试题分析:
【小题1】固定词组sb be sentenced to意思“某人被判刑”
【小题2】动词to不定式后面跟动词原形,所以是 breathe
【小题3】因为前面有动词speak，副词修饰动词，所以是fluently
【小题4】固定词组vote against意思“反对”
【小题5】固定词组burst out laughing意思“突然大笑”
【小题6】固定词组in return意思“回报”
【小题7】固定词组in ruins意思“废墟”
【小题8】与后面的词stay indoors相对应，所以是outdoors
【小题9】因为后面有名词world形容词修饰名词，所以是peaceful
【小题10】因为证据是不可数名词，所以是evidence