叶绿体和线粒体的相同点是（   ）
①可利用光学显微镜观察   ②水作为生理功能的一种原料 ③通过囊状结构增大膜面积  
④可通过转录和翻译控制某些蛋白质的合成  ⑤产生的ATP可用于各种生命活动

方框中所给单词的适当形式填空，使对话通顺、正确。每词仅用一次（每空一词）。

Sandy: Mom, I'm really worried.

Mom: Why? What's the ____?

Sandy: I can't find my schoolbag.

Mom: Well, where did you last put it?

Sandy: I can't remember! I ____ a concert yesterday so it might still be in the museum hall.

Mom: Do you have anything ____ in your schoolbag?

Sandy: No, just my books, my pink hair band and some tennis balls.

Mom: So it can't be ____.

Sandy: Oh, wait! I went to a picnic after the concert. I remember I had my schoolbag with me at the picnic.

Mom: So could it still be at the park?

Sandy: Yes. I left early, before the rest of my ____. I'll call them now to check if anybody has it.