1.The water in Lake Superior is mostly totally pure, [color=green]withonly localized areas of pollution. ( I chose " with" and changed it to " in".)
2.Billy the kid, a famous outlaw whowas killed when shot by a sherrif, was named actually William H. Bonney.
( I chose " name actually" and changed it to ‘named as’.
3.The doing of cheese begins with the coagulation of casein, the chief milk protein. ( I chose " doing" and changed it to ‘making’.)
4.A epiphyte is a plant without any roots in the soil.[b] ( I chose " in the soil" and changed it to " in soil".
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1-- wrong choice. Try again. There is a logical impossibility.
2-- Are you asked to change the errors as well as identify them? You found the error, but your correction is wrong. I suppose it should be ‘actually named’.