阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式(不超过3个单词)。

Julie-I have to share a room with my seven-year-old sister, and she's driving me mad(使人发狂)! She has a habit of playing the piano when I am studying, and she always takes my things without(tell) me. I love my sister, but sometimes she's so noisy! What should I do?

An expert  to Julie's letters just now. Here is his advice.

Dear Julie,

You should talk to your sister. Ask her (not play) the piano when you are studying. Let her take your things only if she asks you first. Perhaps she just wants more love from you. Make yourself be an (understand) elder sister! Try spending some time with her and you'll both learn how. (live) happily-with each other.