下列各句中，没有语病的一项是（ ）

In our class _____ of the students _____boys.

If we use new types of energy， they will produce little pollution. ______ they cost very little and never run out.

Why, Jack, you look so tired! –Well, I ___the house and I must finish the work tomorrow

Mr．Black is willing to do ______________ Mrs．Black tells him to do．