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.

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.

我更喜欢在七月旅行，因为那是假期，我不会有任何特殊的义务。

I prefer to travel in July, as it's a holiday period and I won't have any special ___obligations.