It is the air,that is a_____us all.

问题描述:

It is the air,that is a_____us all.

aroud
这是个强调句,也就是去掉it is...that,句子仍然是完整的.
明白强调句的用法,这个句子就变成The air is a___us all.
填around,表示空气在我们所有人的周围.