In May 2011, Americans spent 53 billion minutes on Facebook, ______ it the most popular U.S. website.
Everybody said it was a perfect marriage; no one had ever known________couple.
—There is no way for us to book ________apartment. —Thus we will have to make full use of what we have now.
________of the land in that district________covered with trees and grass.
—The cake is delicious. —Well, at least it is________the one I baked last week.
The pianos in another shop will be________, but________.