Quizzes for review
Every night, two volunteers sentinel the perimeter of the preserve to protect nesting birds.
See correct answer
Every night, two volunteers sentinel the perimeter of the preserve to protect nesting birds.
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Related words
sentinel
IPA(Pronunciation)
Related Words
（ present singular third-person ）
（ US participle present ）
（ UK participle present ）
（ US participle past ）
（ US past ）
（ UK participle past ）
（ UK past ）
English - English
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