I am a safe gun owner. I keep mine ..... lock and key at all times so that my kids and their friends won't be able to touch it.

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I am a safe gun owner. I keep mine ..... lock and key at all times so that my kids and their friends won't be able to touch it. (*) in (*) on (*) out (*) under

This is a companion discussion topic for the original entry at https://english.best/questions/17328,i-am-a-safe-gun-owner-i-keep-mine-___-lock-and-key-at-all-times-so-that-my-kids-and-their-friends-wont-be-able-to-touch-it/