______ difficult the problem was, he tried his best to solve it.

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so difficult very difficult so easy very easy

was the problem; come up with the problem was; come up with the problem was; put up with was the problem; put up with

too difficult to so difficult that difficult enough for too difficult for

strange complex difficult unusual

All None Nobody Everybody

However difficult the problem was Whatever difficult the problem was However difficult was the problem No matter how difficult was the problem

so easy as 　　　　　　　　　 as difficult as much difficult than 　　　　　 less easier than

so easy as as difficult as much difficult than less easier than

All None Nobody Everybody

too difficult a problem a too difficult problem such difficult problem a so difficult problem

such a difficult problem that so a difficult problem as so difficult a problem that as difficult a problem as

so easy as as difficult as much difficult that less easier than

twice so difficult as twice as difficult as as twice difficult as so twice difficult as

too much difficult difficult too much much too difficult too difficult much

too difficult a problem as a too difficult problem that so difficult a problem that such a difficult problem as

as difficult than so difficult as as more difficult as as difficult as