[ Vocabulary ]
What is the primary purpose of synchronizing activities?
A. To create a historical record
B. To ensure events happen at the same time
C. To provide water access
D. To generate electricity

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Past Tenses › ViewI haven’t … been to Peru.
A. never
B. yet
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This book is _____ than the one I read last week.
A. more interesting
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Past Continuous Tense › View
Mr. Lee was playing the piano………………… his brother was ………………….. the guitar.”
A. while/playing
B. when/playing
C. when/played
D. while/played
