question: we suggest you update your existing system to mac os x 10.6 or higher.
Capitalize this past sentence correctly.
A: We suggest you update your existing system to MAC OS X 10.6 or higher.

question: (it is also significant that they were overrepresented in the area of specialists in venereal decease.)
Capitalize this past sentence correctly.
A: (It is also significant that they were overrepresented in the area of specialists in venereal decease.)

question: the featured china guangdong led wall washer lww-3b-60p-3ch manufacturers and listed here are sourced by the karnar lighting.
Capitalize this past sentence correctly.
A: The featured China GuangDong Led Wall Washer LWW-3B-60P-3CH manufacturers and listed here are sourced by the karnar lighting.