"Educational worksheet teaching responsibility at school through sentence completion and picture matching activities."

Final Answer:
1. responsible
2. responsibilities
3. school

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Explanation:
- Sentence 1: “Being ________ is when you take ownership of your own decisions and actions.”
The word that fits here is *responsible* — it describes a person who owns their choices.

- Sentence 2: “My ________ are things that I should do as a good citizen.”
Here we need a plural noun — *responsibilities* (the duties or tasks you must do).

- Sentence 3: “I have many responsibilities at ________.”
The place where students have responsibilities like following rules, doing homework, etc., is *school*.

So the correct words are: responsible, responsibilities, school.