The story ____ by the famous writer is ____ at the factory now [ ]

In the old days， most teenages had to work for the landlord(地主)in the field to help their families, because their families couldn’t education for them.-What a pity!

You can find ________ become more difficultto see clean rivers in our city.

. The boy was sitting at the desk, ______ hard when his mother got home.

Now the Chinese government has made laws ______ the people ______ in some public places like schools and hospitals.