Английский, выбрать как правильно. This means that we can't hide ourselves (off/from/out of) micro-organisms and it is practically impossible to keep the bacteria (off/out of/from) our houses. However, there is no point (of/about/in) doing so because contact with dirt contributes (to/in/into) our immune system. This being said, wash your hands regularly (by/with/of) soap because out of every 9000 bacteria (under/inside/over) your fingernails, 7000 are harmless but the remaining 2000 are extremely virulent.
from, out of, in, to, with, under