阅读下面短文，从短文后各题所给四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
Dear son,
The day that you see me old and I am already not young, have patience and try to understand me.If I get dirty when eating, if I can not dress, have 1 Remember the hours I spent teaching it to you.
If, when I 2 to you, I repeat the same things thousand and one times, do not interrupt me, listen to me.When you were small, I had to read to you thousand and one times the same story3 you get to sleep.
When I do not want to have a shower, 4shame me nor scold me.Remember when I had to chase（追逐） you 5 thousand excuses I invented, in order that you wanted to bathe.
When you see my ignorance on new technologies, give me the necessary time6 do not look at me with your mocking （嘲讽的） smile.I taught you how to do so many things: to eat well, to dress well, to confront（勇敢面对） life.
When at some moment I 7the memory or the thread of our conversation, let me have the necessary time to remember.And if I cannot do it, do not become nervous, as the most important thing is not the8, but surely to be with you and to 9you listening to me.
If 10, I do not want to eat, do not 11 me.I know well when I need to and when not.
When my tired 12 do not allow me to walk, give me your hand---the same way13 I did when you gave your 14 steps.
And when someday I say to you that I do not want to live any more, that I want to die, do not get angry.Some day you 15 understand.
Try to understand that my age is not lived but survived.Some day you will discover that, 16 my mistakes, I always wanted the best thing for you and 17 I tried to prepare the way for you.
You must not feel sad or angry for seeing me18 you.You must be next to me, try to understand me and to help me as I 19 it when you started living.
Help me to walk; help me to 20 my way with love and patience.I will pay you by a smile and by the immense love I have had always for you.
I love you, son.
Your father
