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patrol
mastery UK /pəˈtɹəʊl/ US /pəˈtɹoʊl/nounverb
card 1 of 10 · fill in the blank
Security guards were out _____ patrol when they discovered the broken window at the store.
card 1 of 10 · fill in the blank
Security guards were out _____ patrol when they discovered the broken window at the store.