阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填人一个适当的词或使用括号中词语的正确形式填空。
Do you feel 1 difficult to be happy all the time? Now I’ll give you some tips 2 how to make yourself happy. One way is being unselfish because 3 (self) is the key factor 4 (require) if you want to get along well with others. By 5 (say) being unselfish we mean we should not want everything our own way or demand the best share of everything. 6 way is to look for good points in other people. You’ll find most people pleasant to go with and it will surely make you happy. Third, you can not expect to be too perfect, 7 don’t be too unhappy when you make a mistake. Everything will be OK if you try to make things right. Finally, it is important to remember while you are no 8_ (bad) than others, chances 9 you have may not be much better. In this case, 10_ surest way to be happy is to think yourself above other people.it
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(答案→)it
解析：
【小题1】it 本句的it是形式宾语，真正的宾语是后面的不定式。
【小题2】on 名词tips与介词on连用表示“关于…的建议”。
【小题3】 unselfishness 本空要在句中做主语，故使用名词形式unselfishness。
【小题4】required 名词factor与动词require构成被动关系，故使用过去分词做定语来修饰。
【小题5】saying 介词By的后面要使用动名词doing的形式。
【小题6】Another 这里表示的是列举another另一个。
【小题7】so 上下文之间存在着因果关系，你不要期待太完美，所以不要不开心。
【小题8】worse 固定结构“no+比较级+than…”
【小题9】that\which that引导的是一个定语从句，对chances进行解释说明。
【小题10】 the 形容词的最高级的前面要使用the表示特指。