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

Conservation of water is not the (1)______ of only the government. Common citizens can also make a significant (2)______ in this field. To begin with, we must be conscious that water is life, that it is a precious natural resource and needs to be used (3)_____. Being conscious will help us to avoid (4)______. There are a few simple things that all of us can do. We must not use (5)______ water to clean our car or house.

Select the most appropriate option to fill in blank number 4.