—Have your read the article A Dirty Beijing, which is about air pollution?—Yes. It’s highly informative. I _____no idea that the PM2.5 there sometimes reached 300.
Three of the town's factories have closed down ________ the space of a year.
The old couple used to live deep in the countryside, without easy ________ to shops.
It is ________ challenge for graduates to get ________ job as unemployment is high nowadays.
—I'm sorry I've spilt some tea on the tablecloth. —________;it will wash out.
I am so tired,for I ________ English for 2 hours.