You should make it a rule to leave things______ you can find them again.
A. where
B. when
C. in which
D. that
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It was quiet______ those big trucks started coming though the town.
A. before
B. after
C. until
D. unless
Hardly had he reached the school gate______ the bell rang.
A. while
B. when
C. as
D. as soon as
I recognized you______ I saw you at the airport.
A. the moment
B. while
C. after
D. once
He was about to go to bed______ the doorbell rang:
A. while
B. as
C. before
D. when