—Look! I found a wallet in the classroom—You should give it to its.He must be upset about

问题补充：

—Look! I found a wallet in the classroom

—You should give it to its.He must be upset about losing it.

A. volunteer

B. nurse

C. passenger

D. owner

答案：

A. volunteer

B. nurse

C. passenger

(答案→)D. owner

解析：句意：看，我在教室里发现了一个钱包。你应该把它还给它的主人，丢了钱包他一定很不安。根据句意，钱包应该还给失主，故选D。