Students have to pay for the loan by getting extra marks in future exams.

学生必须通过在未来的考试中获得额外的分数来偿还贷款。

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There are bound to be question marks over his future.

他的未来肯定会有很多问号。

《柯林斯英汉双解大词典》

To make sure that a premium paid today can pay for a benefit promised for tomorrow, an insurer determines the amount it will need for future benefits, marks that amount as a liability, and puts aside funds to pay for it.

WSJ: Scott Harrington: Congress's Long-Term Care Bomb

If the present seems just about tolerable, though, there are big question marks about the future.

ECONOMIST: A survey of Russia

However, the channel changed hands last month, raising question marks about its future direction.

BBC: NEWS | Business | Murdoch 'eyes' Russian investment