The world is a(a) of uncountable natural and man b(b) objects. Natural c(c) are stones, trees, air and d(d). Man-made objects are houses, cars, e(e) and chemicals. Natural f(f) are cyclones. earthquakes, volcanoes, storms and ocean g(g). Life exists h(h) different conditions. It is very i(i) to keep j(j) environment clean.
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