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.
Comprehension:

Sanitation refers to public health conditions (1)______ to clean drinking water and adequate treatment and disposal (2)______ human waste and sewage. (3)______ human contact with faeces is part of sanitation. Sanitation system (4)______ to protect human health by providing a clean environment (5) _____ will stop the transmission of disease.