—Congratulations! Among the best pictures in the competition，I found _______. Why did you draw it?一During the trip to the Yellow Mountain _______ May.

John, look at the time. ____ you play the piano at such a late hour?

Don’t use water to put out the fire if oil catches fire. As is known, oil ____ float on water.

Living in a fast-paced world, we                  get left behind if we stop learning.

----- I want to know if I _________ smoke here. ----- No, you ___________. Can’t you see the sign “NO SMOKING” there?