I know you have to move because you got a great job. Just promise me that we'll keep ..... touch even though you're going to be so far away.

English as a Second Language Single question discussions
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I know you have to move because you got a great job. Just promise me that we'll keep ..... touch even though you're going to be so far away. (*) on (*) in (*) under (*) out

This is a companion discussion topic for the original entry at https://english.best/questions/17182,i-know-you-have-to-move-because-you-got-a-great-job-just-promise-me-that-well-keep-___-touch-even-though-youre-going-to-be-so-far-away/