The problem is () difficult for us()

The problem is () difficult for us() The physics problem is too difficult for us _____ The problem is too difficult for us to solve.=The problem___ The problem is too difficult for us to work out.(改为同义句) 1、The maths problem is too difficult for us to ( ).A、work it the problem is too difficult for us to work out中的work out为什么 The problem is too difficult for us to solve it. 这个句子里面的it 为 This problem is too difficult for us to ____ the problem is ___difficult for us ____. the math problem is _____ difficult for me ____ solve The problem is difficult for a little girl to The problem is difficult for me to work out.