句子翻译（共5小题，每小题3分，满分15分）请根据中文及括号内的提示翻译下列句子。
【小题1】他很感激我为他做的一切并把我当最好的朋友对待。(be grateful to; treat)
【小题2】 实际上学好英语有很多简单的方法, 例如看英文电视或和外国朋友在线聊天。 (actually, a number of, such as)
【小题3】除非我们净化我们的环境，否则人类可能将无法生存。（clean up, survive）
【小题4】他谋求良好生活的能力受到了他缺乏教育的限制。(earn a good living, be limited by; lack of)
【小题5】杰克给了我一个坚定的眼神，这眼神表明他不会改变主意，也不会屈服。(determine, change one’s mind, give in，定语从句)
He was very grateful to me for what I had done for him and treated me as his best friend.
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(答案→)He was very grateful to me for what I had done for him and treated me as his best friend.
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