I will never forget the days _______ I spent with my friends in Beijing
A. when
B. that
C. in which
D. on that
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Smoking, _______ is harmful for people’s health, is nevertheless popular nowadays
A. though
B. that
C. although
D. which
I will never give in _______ they might do or say about my plan
A. whatever
B. however
C. no matter how
D. how
John fell asleep _______ he was listening to the music
A. after
B. before
C. while
D. as soon as
They didn't start the work ______ their teacher came back
A. until
B. while
C. as soon as
D. if
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