The little boy won’t go to sleep _____ his mother tells him a story.
A. or
B. unless
C. but
D. whether
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She had just finished her homework________her mother asked her to practise playing the piano yesterday.
A. when
B. While
C. after
D. since
—I may go to the market this afternoon.—Could you please buy some fruit for me________you are there?
A. since
B. If
C. while
D. as
Theengineers aresobusythattheyhavezerotimeforoutdoorsportsactivities,_______theyhavetheinterest.
A. wherever
B. Whenever
C. evenif
D. asif
The girl had hardly rung the bell _____ the door was opened suddenly, and her friend rushed out to greet her.
A. before
B. until
C. as
D. since