A plain, dirty looking old envelope with a few words scrawled across it, apparently at random. 
A simple old envelope only had several words written on it, seemingly at random.
There was nothing to see on the brand new envelope.
Flights have been proven to repair the ozone layer.
This paper restricts the amount of detailed data that can be communicated.
A man is using a computer to make toast
a boy and girl play at the park
Currently, there isn't anyone responsible for evaluating GAO.
a person is holding a horn