It is sometimes possible to have a boat ride.
A.since
B.while
C.thought
D.that
to prevent problems it is important to
A.define roles clearly.
B.work as efficiently as possible.
C.treat each other with extra care.
According to the author, a PC is ______.
A.a luxury that only a few people are able to possess
B.a tool to enhance our creativity and intelligence
C.a necessity for life that we can't do without
D.a way to make the world a better place
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