[ Grammar and Vocabulary ]
If you don’t eat _________ healthy food, your immune system could become weaker.
A. enough
B. always
C. often
D. regularly

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Grammar › Viewa person who actively opposes or is hostile to someone or something; an adversary
A. protagonist
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Grammar › View
If I ……… you were ill, I would have visited you and brought you flowers.
A. had known
B. knew
C. had know
D. had knew