The importance of saving gas________be stressed too much.Automobiles use up some 70 billion gallons of gas a year.[ ]

下列各句中，加框的成语使用恰当的一句是（　　）

I don’t like this kind of drink because there’s ______________ sugar in it .

Teachers should encourage students to practice ______ English as much as they can.

We’re going to the Great Wall tomorrow. —_______.