Watch for compounds that exist in BOTH readings with different meanings:
一行 (xíng) = 'a party of travelers / a delegation', but
一行 (háng) = 'one row / one line (of text)'.
车行 (háng) = 'car dealership', but
车行 (xíng) = 'to drive (of vehicles)'. Pick the reading that fits the meaning, not the other way round.