Many things that were once considered useful and _____, for example, tobacco, is now thought harmful.
______ the Atlantic Ocean crosses the equator, the trade winds cause a flow of water to the west.
Quancheng Square is one of _____ largest in China, _______second to Tian’anmen Square.
—Bruce, we are taking a ship trip to Australia tomorrow. —That sounds exciting. _______.
He changed so much that I didn’t _______ him at first sight.
Do you know when ________?