根据语篇内容，用恰当的短语填空，使之意思完整。

     Thanks for your invitation. I'm sorry I can't visit you this week. I am __1__. This evening I'm going

to my cousin's house. It's my cousin's birthday. Today I have a toothache, so I have to see the dentist

tomorrow. On Friday, there will be a math test, and I __2__. On Friday evening, a new film will be on,

and I'm __3__ with my friends.

呋塞米对治疗急性肾功能衰竭有利的因素是：

A．抗利尿作用

B．增加肾血流量

C．促进前列腺素E(PGE)合成

D．竞争性拮抗醛固酮

E．抑制碳酸酐酶