fit in:phrasal verb
• to feel that you belong to a particular group and are accepted by them
It's no surprise she's leaving - she never really fitted in.
• If one thing fits in with another thing,they look pleasant together or are suitable for each other
It's a very nice sofa but it doesn't fit in with the rest of the room.
right:修饰语
right adverb EXACTLY
right adverb TITLE
right adverb CORRECT
right adverb SUITABLE