My parents were quarrelling about me ____ I could not quite tell why.
A. since
B. though
C. if
D. until
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--- 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
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