You can find ________ become more difficult to see clean rivers in our city.
—Bob, please tell me . —In South Hill School.
The lady in the sitting room be over sixty. She looks so young.
It’s reported that the Chinese government provides free milk powder (奶粉)children in poor areas.
At present, lots of people would rather in the country because there is pollution in the city.
It’s dangerous a close look at the tiger in the zoo.