What has made him look like lacking sleep?—– _____ his wife is ill and he has to get up several times a night to attend to her.

下列各句中，划线的成语使用恰当的一句是（ ）

I don’t care what people think.—Well, you _______

The result depends on the use we _______ the energy.

Mother made a promise ____ I passed the college entrance examination she would buy me a mobile phone