短文改错。

　　A thick storm of sand(沙尘暴) turned Beijing        1.________

sky into blue last Wednesday.Cars drove with               2.________

lights on.School child walked with their shirts,              3.________

coats and anything else cover                                         4.________

their nose.Some women wore scarves(头巾)                 5.________

over their heads when the storm become stronger.         6.________

"Sand can be sweeping into the air when there               7.________

is a drought(旱灾).Too much trees have been cut           8.________

this years.It made the sandstorm problem worse.            9.________

So something must be done to keep the air nice or          10.________

clean," said the scientists.