Ответ:

1. The Smiths are collecting rubbish, aren't they?

2. My sister can speak French, can't she?

3. They study at a secondary school, don't they?

4. John has passed the exam, hasn't he?

5. My parents cleaned out the pond, didn't they?

Объяснение:

Как строятся подобные вопросы:

<Основное предложение>, <глагол помощник в противоположной форме> <местоимение, обозначающее подлежащее в основном предложении>?

You (do) have a hamster, don't you?

You don't like eating soup, do you?

Mark Zuckerberg is the richest person in the world, isn't he?