In May 2011, Americans spent 53 billion minutes on Facebook, ______ it the most popular U.S. website.
More than a dozen students in that school _______ abroad to study medicine last year.
----Why did you leave that position? ----I ______ a better position at IBM.
Some experts demanded that children _______ time to sleep and play.
—Mum, can I listen to music while doing homework?— Don’t even think about it._____.
Evelyn is supposed to attend church soon, but nobody is sure whether she or not.