根据短文内容，从方框中选择恰当的词语填空

mess，depend on，ill，while，lend，hate，fair, take care of

(Here is a mom's letter to her son.)

Dear son,

    When I grow old one day, pleaseme and try to understand me. Don'tsome of my behaviors(行为). If I make a(n)when eating, please clean it up. If I can't dress myself, please help me. If I say something again and again, please listen to me. you were a kid, I read you the same story over and over again. If I can't walk, pleaseme your hand. I did the same thing for you when you were learning to walk, When I am, you should look after me well. I can only you. I have no one else. I looked after you, so in the future it'sthat you look after me.

    I love you, son!

    Your mom, 

Linda Brown