The little boy ____ by the big one this morning. 

You have to be 18 years before you _________ to drive a car.

—Where ______cotton _____?—Oh，I don’t know.Let’s ask Mr Wu.

Unluckily, my grandma fell downstairs and her legs were badly _______. 

—It’s difficult for the village children to cross the river to get to school. We think a bridge_______over the river.