【题目】---Have you seen _______empty box?

【题目】One of you will stay here, and the others will ________.

【题目】In fact, I don't like the song ________. It's very boring.

【题目】—________ do you Chinese say hello to each other when you meet?

【题目】________ necessary to return the books to the library.

【题目】________ careful! ________ cross the road when the traffic light is red.

【题目】Don't touch the cup with your ________. It's too hot.

【题目】Now walking after dinner is a popular way ________ fit and healthy.

【题目】It's dark and they both walk arm ________ arm with each other.

【题目】---Have you got________ book on travelling?