1. The (properties) of coca are (similar) to (those) of opium, but coca is not (such) strong a narcotic. D: how to correct it?
2. The Andromeda galaxy, (like) the Milky Way, (is orbited) by several (companion) galaxies but contain about (as twice) many stars. D :how to correct it?
3. The (layers) of an elephant’s tusk are deposited (from) the pulp, (yet) that the innermost layer is the (newest). C: how to correct it?