The air in Dongying is much worse than that in many other cities. We must do       to protect our environment. 

 What _________ does he sometime get?

—I hear you have to get up early every morning.  —Right. It’s one of the _______ of my family.

 Now, people regard drinking tea ________ a culture more than a habit.

 ---Is this book Betty's? ----Yes , it's ________.