I find difficult to work out the problem.
I find the problem difficult to work out.
I find difficult to work out the problem.
So difficult it to work out the problem that i dicided to as
So difficult __ it to work out the problem that I decided to
So difficult __it to work out the problem that i decided to
I found it difficult to work out the problem without your he
I think .difficult to work out the problem.A,it B.this C.tha
I thought it difficult for me to work out the problem 如果对 是不
He is busy to work out the difficult problem. 改错
The problem is difficult for me to work out.
He found it difficult to work out the problem.
I don’t think we can find a new day to work out the problem.