exmaple1: A study commissioned by the Department of Agriculture showed that if calved exercise and associate with other calves, they require less medication and gain weight more quickly than those raised in confinement.
note: the correct answer did not use "than those raised in confienment do".
example2: Salt deposits and moisture threten to destroy the Mohenjo-Daro excavation in Pakistan, the site of an acient civilizations that flourished at the same time as the civilization in the Nile delta and the river valleys of the Tigris and Euphrates.
Note: the correct answer did not use "as the civilization in.... did".
exmaple1: A study commissioned by the Department of Agriculture showed that if calved exercise and associate with other calves, they require less medication and gain weight more quickly than those raised in confinement.