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)
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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)
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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）
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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)
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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)
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小题1:He was very grateful to me for what I had done for him and treated me as his best friend.
小题1:Actually, there are a number of simple ways to improve your English, such as watching English TV shows and chatting with foreign friends online.
小题1: Unless we clean up our environment, human beings may not survive.
小题1: His ability to earn a good living is limited by his lack of education.
小题1:Jack gave me a determined look, which showed me that he would neither change his mind nor give in.