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.

《河北省农村信用社安全保卫工作暂行规定》规定，农村信用社用枪单位对枪支、弹药的保管必须符合哪些要求？