1. used
I sell used cars.
I put the used syringes in a can for safe disposal.
We have three spare rooms, none of which can be used.
Cue cards are used primarily on television to help the actors remember their lines.
An estimated 20% of the water used by homeowners in cities is used for their grass.
I don't understand and I'm not used to not understanding. Please explain it once more.
The methodology used in his study is also helpful to us in conducting our research.
It's not as difficult to find a native speaker to help you with your language studies as it used to be.
India ink produces an interesting pattern when used as a dye.
The meaning of a word is determined by the context where it is used.
Certain poisons, properly used, are useful.
Tom put together one million dollars in unmarked, used bills as the kidnappers had told him to do.
I shouldn't have used the word "password" as my password.
Work and play are words used to describe the same thing under differing conditions.
Many rivers have been so polluted that they can no longer be used for drinking water.