怎样改为定语从句?

怎样改为定语从句?

题目
怎样改为定语从句?
1> She lectured on a topic,I know very little about it.2>I returned the money.I had borrowed it from my roommate
答案
1.She lectured on a topic,about which i know very little.
2.I returned the money which i borrowed from my roommate.
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