给定一组句子和一个关键词，筛选出包含该关键词的句子，并将其组成一个新的段落。
1. The cat sat on the windowsill.
2. The dog ate his dinner quickly.
3. The bird flew away.

关键词: 食物
包含关键词"食物"的句子为第二句话"The dog ate his dinner quickly."，因此新的段落为："The dog ate his dinner quickly."