[ Grammar ]
In the vessels of the vascular system of the giraffe _____ of valves that ensures a needed supply of blood to the head.
A. are series
B. is seroius
C. is a series
D. a series is
Select your answer:
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a) is/ live
b) does/live
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This club is for members only. You can’t go in _______ you are a member.
A. In case
B. Unless
C. If