询问情绪原因及回答（Why/Because） — 英语词汇题
题目
补全对话，每空一词，使对话通顺合理。
Mike: You look sad. 1.____ are you sad?
Sarah: 2.____ my little cat is ill (生病的).
Mike: Don't be sad. Let's take it to the vet together.
Sarah: OK. Thank you, Mike. Now I feel a little better.
1.____ 2.____