题目：
用单词的适当形式填空。
1. I want to write several letters, where can I buy some ( write) paper.
2. She used to (prefer) reading at home to playing outside.
3. I’m sorry to ( trouble) you, but I need some help.
4. On the ( two) floor you can see Franklin Bank.
5. If you are a ( strange) in this city, you'd better buy a map first.
答案：
1. writing 2. prefer 3. trouble 4. second 5. stranger
