In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given.
Passage:

Flood is a commonnatural disaster. Scientists have often tried to ..........(1) floods. There are a numberofreasonsthat ..........(2) floods, including heavy rain and cloudbursts. Due to these reasons,
rivers ................(3) their banks and cover the surrounding land. Sometimes, dams break and cause disastrous floods that ...............(4) to large-scale destruction. Timely safety ...............(5)
should be taken to save humanlife and property.