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

There is a fantastic body of evidence which indicates that (1)_____ brings down the stress chemical and it enhances (2)______ happiness chemical. The videos of medicos (3)_______ in hospital corridors have helped us (4)_______ in these gloomy times. Indeed optimism and (5)________ are the need of the hour.