[ Vocabulary ]
Observations involving numbers and units
A. measurement
B. microscopic
Select your answer:

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Grammar and Vocabulary › ViewI ____________ (not know) about Chris if you hadn’t told me.
A. would not have known
B. would have known
C. would know
Vocabulary › View
Facebook is a popular _____ for connecting with friends online.
A. platform
B. structure
C. system
D. program
