five—____—fifteen—____

已知$\alpha$∈($\frac{\mathrm{\pi }}{2}$,$\mathrm{\pi }$)，sin$\alpha$=$\frac{3}{5}$,则tan($\alpha +\frac{\mathrm{\pi }}{4}$)等于（    ）

Sam: Good afternoon, Mum.

Mum: Good afternoon, Sam.

Sam: ____

Mum: He's in the kitchen.

Sam: ____

Mum: No, he isn't. ____

Sam: Where's my sister? Is she in the kitchen, too?

Mum: No, she isn't.____

Sam: ____

Mum: She's reading a book.

①自己享受其中的乐趣。____

②内心十分不安。____

③高兴得不能控制自己。____

④自然形成而合乎理想。____