A/An_________ can use his drawings to tell about beautiful mountains, the blue sea and many other things.

— You must be thirsty after walking for such a long time. — Yes. Please give me some　　　 to drink.

-You look so worried, what’s wrong?  -More and more people like me begin to worry about the ______ pollution after the haze (雾霾) appeared in Beijing and some other cities in China. 

Playing games __________ a lot of ___________.

To my ________ , the square was so clean after the big meeting.