完成下列同义句变化。

1.—I'm sorry I'm late again. —That's all right.

   —I'm sorry I'm late again. —It ______.

2. Our school has twenty classes. 

    ______ twenty classes ______ our school.

3. These children walk to school every day.

    These children ______ to school ______ every day.

4. Thank you very much for your help.

    Thanks ______ for ______me.

5.Your trousers are very dear. They are nice, too.

   Your trousers are ______ dear ______ nice.