They try _____(not,do) that again,but they fail _____ (do) it.

They try _____(not,do) that again,but they fail _____ (do) it.
They try _____(not,do) that again,but they fail _____ (do) it.

They try _____(not,do) that again,but they fail _____ (do) it.
not doing,to do
他们又一次尝试不要那样做,但他们失败了.

no to do ,to do

not doing, to do