Each of the following sentences has three errors in grammar, capitalization, usage, or spelling. Write a correct version

[answerhappygod]

Each of the following sentences has three errors in grammar,
capitalization, usage, or spelling.
Write a correct version for each sentence. Avoid adding new
phrases, starting new sentences, or
rewriting in your own words.
4) Jeffreys presentation to a nonprofit group netted him only
three hundred dollars, which is a tenth of his usual honorarium but
he believes in pro bono work.
5) Of all the discoveries and inventions in human history the 4
greatest are said to be these speech, fire, agriculture, and the
wheel.
6) Our latest press release written by our corporate
communication department announces the opening of three Asian
offices.