How long _______home?—For about three months.

_________ that it’s very cruel to kill wild animals for money.

He was riding to schoolhe was hit by a car this morning.

Do you believe that paper is made _____ wood?—Yes, I do. And you can see that books are made _____ paper.[ ]

We must try our best to stop pollution ______ a low-carbon(低碳)life.