[ Comparative and Superlative Adverbs ]
Leonardon worked (harder, more hard) on his school work this year than last year.
A. harder
B. more harder

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Vocabulary › ViewThere are many _________ taking part in the contest.
A. competitive
B. competitors
C. competitions
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Recent research shows baboons make ______ sounds
A. mass-produced
B. three-dimensional
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