--- Mom, what did your doctor say?--- He advised me to live____ the air is fresher.
A. in where
B. in which
C. the place where
D. where
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If you are traveling______ the customs are really foreign to your own, please do as the Romans do
A. in which
B. what
C. when
D. where
In time of serious accidents,_________ we know some basic things about first aid, we can save lives.
A. whether
B. until
C. if
D. unless
He was told that it would be at least three more months____ he could recover and return work
A. when
B. before
C. since
D. that
In my opinion, life in the twenty-first century is much easier than ________.
A. that used to be
B. it is used to
C. it was used to
D. it used to be