As to the sleeping powders, I knew by this." He suddenly produced a small cardboard box, such as chemists use for powders. 
He knew about the sleeping powder because of the chemists' box.
He didn't know what the box was used for.
Where in Texas have you played?
They're able to enjoy themselves without alcohol.
There is a boy and two women on a street.
The office has not and will never look outside the state for hires.
The people are at the movies.
There is an advertisement on the streets of Turkey with people walking by.