1.what is the persentage of car's smoke in the bad air?
2.why shoud not the governmentlet people stop smoking?
3.how will the government solve the air pollution problem?
4.what is the average of the air pollution index nowadays?
5.waht is the persentageof H.K children having asthmatic now?
6.how serious is the air pollution in Hong Kong?
Anyway thanks a lot~