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

If they had known what was coming next, they __ their mind.

Children often do as well as what adults, particularly parents and teachers, ______ of them.

下列各句中，没有语病的一项是（ ）

ll. I _____ you _____ in this city.How long have been here