可用氧化还原滴定法测定TiO₂的质量分数．在一定条件下，将粉体溶解并将溶液中的Ti^2﹣氧化为Ti³⁺，再以KSCN溶液作指示剂，用NH₄Fe（SO₄）₂标准溶液滴定Ti³⁺至全部生成Ti⁴⁺．【注：NH₄Fe（SO₄）₂是一种复盐，含有两种阳离子】．请回答下列问题：

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  Dear Peter，

    Without knowing more about you，it's hard for me to give you some good advice．

    But firstly．I am sure that you are 1 ．You said that nobody would care if you left  home．What about your2  ? And other family members ?It seems that you are very 3．You'd better go to a doctor or talk  4 your parents．They will be able to help you．

    Secondly，I'm sure there's someone else in your class who feels lonely，  5．You never know 6other people feel．Try to make friends with your classmates．And you could  7  a club to meet new people and make friends，too．

    You 8  find happiness in yourself．So my 9advice is to write a list of all the good things about yourself，learn to like yourself，and then  10  will see your confidence(信心)and like you，too． 

                                                                                                                                                                                                                   Yours，

                                                                                                                                                                                                                     Lily

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