“Wechat”(微信)really makes a great _____to people’s life. It’s easier for us to keep in touch with others.

—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.

--Are you sure Mr Bush is at home? --Let’s try ringing the       _.

 I  will do an ____with Jim, a popular singer ,at the TV station tomorrow morning .

He is __________ father.