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concentrate
mastery UK /ˈkɒn.sən.tɹeɪt/ US /ˈkɑn.sən.tɹeɪt/verbadjnoun
card 1 of 10 · fill in the blank
The students concentrated _____ on the difficult math problem during the exam.
card 1 of 10 · fill in the blank
The students concentrated _____ on the difficult math problem during the exam.