Please help me with english? im really stuck.?

The [1] FIRST pioneers on the Great Plains [2] ENCOUNTERED many kinds [3] OF dangerous animals. Grizzly bears and [4] HUGE herds of bison were menaces to [5] EARLY settlers. One of the [6] MOST ferocious beasts of the plains [7] WAS a [8] GRIZZLY protecting her cubs. However, [9] NEITHER the bison nor the grizzly was the most feared animal [ 10] ON the frontier. Not even the deadly [11] RATTLESNAKE- nor [12] ANY of the other prairie creatures was dreaded so much as the skunk. You may think [13] "OH, that is [14] RIDICULOUS." [15] YET it is true. Skunks were not feared because they [16] SMELLED bad but, instead, because they [17] SO often carried [18] RABIES. Since there was no vaccine for rabies in [19] THOSE days, the bite of a rabid skunk spelled certain [20] DOOM for the unlucky victim.