Hardly had he reached the school gate______ the bell rang.
A. while
B. when
C. as
D. as soon as
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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
______I listen to your advice, I get into trouble.
A. Every time
B. When
C. While
D. Until
She had a stomachache ______she ate something bad.
A. so
B. because
C. or
D. although