答案：1.I've always longed for the days when I will be able to be independent. 2．I have a friend whose father is an engineer. 3．They planted the trees that/which didn't need much water. 4．This is the best method that can be used against pollution. 5．They sent the elderly who always feel lonely some fruits，cleaned the rooms and had

　　a good chat with them. 二、名词性从句 名词性从句包括主语从句、宾语从句、表语从句和同位语从句。名词性从句是具有名词功能的非独立分句。 [经典例句] ①I think that it's our duty to help parents do some housework. 我认为帮助父母做家务是我们的职责。(宾语从句) ②I took pride in what I had done in the absence of my father. 我为自己在爸爸不在家时的表现感到自豪。(宾语从句)

　　③There is no doubt that children there are badly in need of care and help. 毫无疑问，那里的孩子急需关爱和帮助。(同位语从句) ④What interests me most is literary books，especially those by famous writers. 我最感兴趣的是文学书，尤其是由著名作家写的。(主语从句)

　　⑤My English is just OK and the two main problems in my study are that I feel it difficult to learn words by heart，and that I often feel nervous when speaking English. 我的英语还不错，学习中最主要的两个问题是我感觉记单词难，而且说英语时经常感到紧张。(表语从句)

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