How time flies! Ten years _______ really a short time.

It           sunny today, but it            cloudy yesterday.

 —Mr. Smith has decided to 　　　 his bad habit of smoking.—That’s good news. I hope he can do it.

The environment is becoming worse and worse. I think we should do something to ____ people ____ cutting the trees in order to protect the earth.

Xi Jinping, the new president of our government calls on us to ________ food.