In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

Trees are one of the gifts of the nature which are of great (1)_______ for all living beings and
environment. They have (2)________ benefits to living beings providing natural herbs,
vegetables, fruits, wood, timber, etc. Trees are the (3)_______ of many birds and insects.
They are also considered as the (4)_________ part of the atmosphere which help in reducing
pollution. Conserving trees and spreading awareness to plant trees will save the atmosphere
from depletion and (5)_______ survival of all forms on earth.