I am writing to express my _______ for the safety of children travelling on school buses, especially those on high-risk and highway-speed routes.

-What a pity! He got nothing in ______ for his hard work..

There is no known_____for this disease but it can be______.

One thousand dollars a month is not a fortune but would help cover my living _______.

Finding information in today’s world is easy．The_______is how you can tell if the information you get is useful or not。