根据句子意思和所给的首字母，完成单词。

1. Her mother is a nurse and she works in a h_______.

2. My English is p_______. Can you help me with it?

3. Do you k_______ the young man in a white shirt?

4. I'm free tomorrow. I can go for a p_______ with you.

5. Could you please b_______ some food here?

简述农业发展对社会带来的变化。