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challenge
mastery/ˈt͡ʃæl.ɪnd͡ʒ/nounverb
card 1 of 10 · fill in the blank
Learning a new language can be a _____ challenge, but it is very rewarding.
card 1 of 10 · fill in the blank
Learning a new language can be a _____ challenge, but it is very rewarding.