mark ____ work out this problem.so he goes to ask his teacher for help (can,can`t,must,have to,has to )

mark ____ work out this problem.so he goes to ask his teacher for help (can,can`t,must,have to,has to ) Mark isn't coming to the concert ____ he has got too much work to do. This problem was very difficult.Lily couldn't ____问选项work it out 和work out it的区别 He couldn't work out the math problem.(改为同义句) He ____ ____ ____work out the math problem. 同义句：Tom told his teacher he couldn't work out the probloms.Tom told his teacher he ____ ____ ____ work out the probloms. I couldn't find another way ____ the problem A to work out B working out C work out D worked out l don't know how l can work out this physics probiem.改为同意句l don't know ____ ____ work out this physics probiem 初二英语The math problem is too hard ____.A.that we can't work it out B.for us to work out C.that we can't work out D.for us ro work it out This problem is so difficult that we can't work it out.(保持句意不变）This problem is ____ difficult ____ us _____ work out. The problem is very diffcult.Wecan't work it out.（合并）The problem is ____ difficult for _____ _____ work out.对不起 请问一下为什么？ The math problem isn't easy for me to work out (保持原句意思)The math problem is ___ ____ for me to work out 12.You can’t work out the problem in that way.(保持句意)It’s ____ _____ you to work out the problem in that way. i can't work out the problem.it's too difficult同义句转换 i have ____ ____ out the problem. .Sorry,I can't work it out ____ A.too B.either c.also 选该答案的原因 Can he work out the problem (同义句） ____ he ____ ____ work out the problem? Can he work out the problem?(同义句） ____ he ____ ____ work out the porblem? the maths problem is ____ easy for us to ___.A,too,work it out B.too,work out C,so,work out itD.very,work out为什么 I have some problems ____(work)outI have some problems ____(work) it out