Finding information in today's world is easy.The ________ is how you can tell if the information you get is useful or not.
A．knowledge B．ability
C．competition D．challenge
Friendship is both ________ source of pleasure and ________ component of good health.
A．a; a B．/; / C．the; a D．a; the
As ______ mountains surrounding our village are turning much greener, they have become ________ home to a large number of wild animals.
A．the; / B．the; a C．/; a D．the; the
．—You've dropped ________ “s” in the word “acros”．
—Oh, ________ letter “s” should be doubled like this “across”．
A．a; a B．an; a C．an; the D．the; the
We Chinese have a dream— ________ dream to turn a welloff life into ______ reality by 2020.
A．a; / B．the; / C．a; a D．the; the
The teacher praised me for ________ progress I'd made, which was ________ great encouragement to me.
A．the; / B．the; a C．/; a D．/; /
