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mastery UK /ˈmæn.də.t(ə)ɹi/ US /ˈmæn.dəˌt(ɔ)ɹi/adjnoun
card 1 of 10 · fill in the blank
Wearing seatbelts in cars became _____ after new safety laws were passed.
card 1 of 10 · fill in the blank
Wearing seatbelts in cars became _____ after new safety laws were passed.