Trees are very useful (a) —------ man. They are highly essential (b) —----- our existence. They protect the rich top soil (c) —---- getting washed away (d) —----- rain water and floods. We can see trees being grown along the mountain slopes (e) —------ the roadsides, (f) —----- the parks and gardens. They add beauty (g) —------ our lives. They provide us (h) —----- food, wood, shade, shelter and so on. They take (i) —------ carbon dioxide and produce oxygen. So, we should take care (j) —------ trees.