He had no difficulty__the problem.a:working out b:to work ou

He had no difficulty__the problem.a:working out b:to work ou he is the second () out the problem.A.working B.to work C.wo she had no difficulty _ the problem.A.worked out B.working o He had no difficulty working out the problem为什么是working I have some problem ____ it out.A.working B.to work it is easy for you____.a.to work out the problem b.working o He thought he had d______ working out the math problem. He had some d__ in working out the problem. The problem is a bit difficult ,but he can ( ) to work it ou He can work out the problem a( Where's Mike?He is working _____ physics A in;problem B out; he has no difficulty ---------（work）out the problem .