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ocean
mastery UK /ˈəʊ.ʃən/ US /ˈoʊ.ʃən/nounname
card 1 of 10 · fill in the blank
Millions of birds migrate _____ the ocean every year to reach their winter homes.
card 1 of 10 · fill in the blank
Millions of birds migrate _____ the ocean every year to reach their winter homes.