_______ the smoggy weather, the central government has taken action to deal with it.

This is such a letter ____came last night．

hat you are chosen to be a volunteerat the London Olympic Games, what will you do

(2013·高考湖南卷)The university estimates that living expenses for international students________around $8,450 a year，which________a burden for some of them.

下列各句中，没有语病的一句是