求翻译下面这句话的中文意思：
Many people belive that one day the earth we'll be destroyed if people do not learn to live in peace.
拜托~~~谢谢各位了~~~!
再补充一句：The books were being reading then 这句话的意思~~
蟹蟹啦~~~
还有这两句话的意思：My mother said :"A new computer would be sent in six mouths."
My brother :”said that on my homeworks would have been done bu the end of August in two thousand and seven“