Why does she steal things ________ she could easily afford to buy them?[ ]

下列各组句子中加横线的词语，解释有误的一项是（ ）

The robot Tony was said already in Larry’s house before he returned

I walked up to the top of the hill with my friends, ________we enjoyed a splendid view of the lake[ ]

The bell rang ______ the teacher was explaining the answer to the students.