这是状语从句的句子吗 急用

题目

这是状语从句的句子吗 急用
1.Because it's Sunday today,there isn't any class.
2.It's getting warmer and warmer as summer comes.
3.He used to sleep with windows open.
4.The students had to learn all by themselves as the teacher was not there.
5.His eyes hurt so badly that he had to stay in bed.

答案

3.opened
1.原因状语
2.时间状语
3.表示一种状态
4.原因状语
5.so that 句型