—You look so worried, what’s wrong?—More and more people like me become to worry about the __________ pollution after the haze (雾霾) appeared in Beijing and some other cities in China.
Victor has ______ aunt and two uncles.
Linda is thirteen ________ old. She is my friend.
—you have a brother? —Yes. His name is Peter.
----______ is your skirt? ----Black.
——What’s this? ——______ a key.