1. (2019八下·天台期末) 用方框中所给单词的适当形式填空，每词仅用一次，每空仅填一词。

decision    since  suddenly   thousand   volunteer

1. （1） In May, of visitors have a vacation in Tiantai.
3. （2） We spend two hours in the old people's home.
5. （3） As soon as I had made the , I felt a lot more relaxed.
7. （4） I haven't seen Tom I went to high school in 2018.
9. （5） While I was walking in the street, a red bus stopped by me.