Had he studied harder, he_______ the exams.

What’re you ____________— My husband’s health problem ___________ me a lot.

下列句子加点词的活用类型与例句相同的一项是（ ）例句：牖其前以通明

Lin Tao, can I use your English dictionary— Sure. But you _______ return it before the class.

It was not until dark he found he thought was the correct way to solve the problem.