this problem is difficult and ---------- (bore).
This problem is more difficult than that one.This problem( )
It is difficult () out this maths problem
This problem is too difficult.I can't work it out,and()
This problem is too difficult.I can't work it out,and().
What a_______book this is!(bore)
This math problem is so difficult that only ( ) students can
This math problem is so difficult that only ________ student
This problem is too difficult.Can you show me ______________
This problem is too difficult for us to ____
This maths problem is so difficult that only __________ stud
This problem is ( ) difficult ( ).第一空为什么不能用very
this is the most difficult problem i have ever handled