Yesterday we __ an expert to help solve this problem.A calle
Yesterday we __ an expert to help solve this problem.A calle
Help me to solve this problem
I wonder __ we can solve this hard problem.A.wh
i wish i __(know)how to solve this problem.
I can help you to solve this problem.
any one can help me to solve this problem?
help to solve the problem?
we have got to ( )a new way to solve this problem
This is a s_____ problem.We must solve it
we found this problem difficult to solve solve为什么不用被动
can,we,learn,solve,a,to,forget,problem,by,it
we can solve a problem by learning to forget