You should be more confident_____ you attend the competition.
A. before
B. since
C. after
D. when
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Don't leave the classroom_____ you finish your exercises.
A. before
B. since
C. after
D. when
Please buy a dozen of egges_____ you go to the grocery store.
A. before
B. since
C. after
D. when
Mary greets_____ at the gate of her store every morning.
A. costume
B. custom
C. customer
D. customers
The online store offers free delivery_____ the goods you buy are over 100 yuan.
A. wether
B. if
C. when
D. while