SENTENCES 5

 9-Active voice: Belgian John Joseph Merlin invented roller skates in 1760 .

9-Passive voice:Roller  skates   were invented in 1760 by Belgian John Joseph Merlin .

10-Active voice: Acton and Jan Koum founded WhatsApp in 2009

10- Passive voice: whatsapp was founded in 2009 by Belgian John Joseph Merlin .