—These grapes look really beautiful. —They _______! See the price $3.99 a pound. Very expensive, aren’t they!

 ---Whose book is this?---It________ be Ning’s because it has her name on it.

In China when the traffic light is red, you ________ cross the road.

---Whose is the pencil box?---It _____ be Tom’s. Look at his name on the cover!

If you ______ smoke, please go outside.