一、根据首字母提示完成下列句子或对话。
1. Sam helped a b____ old man cross the street.
2. —How do you often get to school?
—I often w____ to school.
3. To s____ healthy, my sister often goes running.
4. I hope you can f____ your way home.
5. This is q____ a difficult math problem. I can't work it out.

1. blind；2. walk；3. stay；4. find；5. quite