When did he leave the classroom?—He left _____you turned back to write on the blackboard

Everyone ______ English hard in our class.

The palace caught fire three times in the last century, and little of the original building _____ now.

Why is the chemical plant closed— Because large quantities of waste water ______ into the Yangtze River.

Mum, I’m hungry. Can I eat _______ bread— Of course you can.