In many circumstances, we take things like towels, soap, snacks, or noodles.
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In this case, I think it would be good to call the police.
What location suits a situation the best? That always depends on the case or circumstance. You can't know the suitability of the location until you have all the facts about the circumstances.
This word uses the kun'yomi readings for both kanji. You haven't learned this kun'yomi reading for 合 yet, so here's a mnemonic to help you:
To know exactly what case or circumstance you're dealing with, you keep a close eye (あい) on things. Imagine your eye really close up to the circumstances, trying to figuring out exactly what's going on.