11.  One afternoon, they were playing in the street just outside the post office.

12.  there is one language that is for use in every country in the world.

13.  not one family is able to give up television completely.

14.  One problem in China is the condition of population.

15.  No one good climber with strong heats should try Popo .

16.  in the United States if you want to invite a friend to dinner you must tell him the place and tine one or two weeks before hand.

17.  One night I listened a English song.

18.  And there're two teaching building , one laboratory building and one big playground in it.

19.  One night, Tom was sleeping, suddenly he heard a sound "Fire!

20.  One night, Banana was sleeping very well.