Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You learned this before with the pair verb 預ける, but here's a mnemonic to remind you just in case:
You need someone to look after your kids for the day. Hey I have an idea! Leave them with the monkeys at a zoo (あず)! Monkeys love kids, and kids love monkeys. Now you can zoom off in your cars (か) for the day!
It's been decided I'll take care of my sister's child on Sunday.
The job of a bank isn't only to take care of money.
I want you to hold onto this for me in case I need it.