Electronic devices such as iPods and headphones can do great harm to our hearing if _______ improperly.
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A
being used
B
used
C
to be used
D
having been used
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The motorcycle competition in the desert, ________ lasted ten days, is over now.
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A
it
B
where
C
which
D
that
In my opinion, life in the twenty-first century is much easier than ___________.
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A
that used to be
B
it is used to
C
it was used to
D
it used to be
Chan’s restaurant on Baker Street,_______ used to be poorly run,is now a successful business.
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A
that
B
which
C
who
D
where