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

A new world research shows that the French (1) ________ large amounts of cheese and butter. Therefore, they have low levels of heart disease. The research (2) ________ that animal fat is good for human body and helps in reducing the risks of heart attack. This study was (3) ________ in 2018 in 21 low and middle income countries. However, it (4) ________ that eating moderately is the (5) ________ key in this regard.