He is extremely foolish______he does not seize the golden opportunity to continue his studies,
A. if
B. as long as
C. even though
D. now that
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The directors have a meeting every Friday______there is nothing to discuss.
A. as
B. if
C. unless
D. in case
______the singer finished her song, the audience burst into applause.
As soon as
B. Since
C. Until
D. Provided
______many people came to the meeting that there were not enough seats for everyone.
As
B. If
C. When
D. So
There was no one to meet him at the airport______he had told no one when he was returning.
A. as long as
B. since
C. whether
D. unless