1.) German engineer who developed the first oil-burning internal-combustion engine in the 1880s
Hmm, maybe Mercedes, or perhaps Benz
Oh, I guess it is this Nikolas Otto guy (hence Automobile)
2.) Scottish mathematician who designed a useful steem engine - a key component to the development of the Industrial Revolution.
James Watt (w00t)
3.) 1870s American inventor of the phonograph and lightbulb. ( Edison )
You already answered it.
4.) German engineer who redesigned the internal combustion engine to run on gasoline.
Benz.
5.) British physicist who, in 1831, discovered that a magnet moving through a coil of copper wire produced an electric current.
Michael Faraday
8.) Italian inventor of the wireless telegraph, or radio in 1895
Marconi
10.) 1830s American invetor of the telegraph
Samuel Morse
11.) Scottish born inveot and teacher of the deaf who is credited with inventing the telephone in 1876
Alexander Grahmn Bell I would imagine
12.) American inventor who developed the cotton gin in 1793, also credited with pioneering the concept of interchangable parts that increased factory production.
Eli Whitney
13.) Former bicycle mecanics who developed and created the first working prototype of the airplane.
The Wright Brothers
14.) Former bicycle mechanic who pioneered the automobile and assembly line for production
Henry Ford
If this is your homework, you really need to learn how to use google better, it is easy enough to enter in "Inventor [Item]" Mind you, I only used it to double check and just left out things I had no clue on.