The math problems are too hard for any one of us to work out.
问题描述：
The math problems are too hard for any one of us to work out.
改为同义句
The math problems are ___ ___ ___ any one of us ___ ___ ___ ___.
The math problems aren't ___ ___ ___ any one of us ___ ___ ___.
答
SO difficult that ,can't work out .
easy enough for,to work out