[ Vocabulary ]
A biological community of interacting organisms and their physical environment
A. oxygen
B. boreal
C. biodiversity
D. ecosystem
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Vocabulary › Viewthrilled, overjoyed
A. eloted
B. elated
C. elatted
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Tenses › View
Choose the correct past tense form of the verb for the sentence: “All of us ______ hard for the physics exam.”
A. studied
B. study
C. will study
D. studying
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