In one case, the professor didn't require students to buy a textbook, just an access code to turn in homework.

有一次，教授并没有要求学生购买教科书，只是需要作业提交的访问码。

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Like many fringe events, some performances at the New York City fringe are free, while others require visitors to buy tickets.

VOA: special.2009.08.05

It does not require students to buy their textbooks either.

VOA: special.2009.09.03

If you could require people to buy health insurance, Justice Antonin Scalia wanted to know, could you require them to buy broccoli?

NEWYORKER: Benched

Real reform will require the buy-in of these stakeholders too.

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One is to simply require them to buy insurance, through an individual mandate for example.

FORBES: Do the Obamacare Insurance Subsidies Make the Individual Mandate Unnecessary?