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.
