In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each blank.
Environmental pollution is a global problem and (1)__________ threat to human survival. The causes of pollution are quite (2)___________, such as contamination of water, cutting of trees and forests, emission of toxic gases etc. Due to (3)___________ factors, the flora and fauna are adversely affected. An awareness to protect the environment is everybody’s (4)____________ duty and we should collectively come forward for this noble campaign. Government is taking strong (5)____________ to check the menace of pollution.
Select the most appropriate option to fill in blank number (1).