Generally speaking, children living in a city can not _____ ox ____ cow.

Hurry up! It’s ______. We’re asked to finish it by 5 o’clock.— You mean we’ve only got 20 minutes left.

Boys and girls, please listen to me _______. I have something important to tell you.

use water to put out the fire if oil catchesfire. As is known, oil ____ float on water.

It is the news　　　 most parents of the hope that there is a safe and socially approved road to a kind of life they themselves have not had, but their children can.