obligation

你有法律义务确保你的孩子接受适当的教育。

You have a legal ___obligation to ensure your child receives a proper education.

父母有法律义务确保他们的孩子接受适当的教育。

Parents have a legal ___obligation to ensure their child receives a proper education.

如果你没有签署合同，你就没有义务支付他们任何钱。

If you have not signed a contract, you are under no ___obligation to pay them any money.