[ 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
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Some vs. Any Lets vs. Let’s Simple Present Tense Indefinite ArticleSimple Past Tense (was/were)To Infinitive or GerundBasic TensesDescribing WordsComparatives
Other quiz: Articles
The sign said to slow down, but Juan didn’t notice ………..warning.
A. a
B. the
C. an
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