QUES: Very many ventilation contractors are willing to pay extra to get a more expensive material such as KE Fibertecs unique HDC material that has a significantly higher dust holding capacity and with that longer washing intervals provided it can be documented to the end user

correct the punctuation.

CORRECTED: Very many ventilation contractors are willing to pay extra to get a more expensive material such as KE Fibertec's unique HDC material that has a significantly higher dust holding capacity and with that longer washing intervals provided it can be documented to the end user.

QUES: In Vienna Weisbach studied mathematics physics and mechanics

correct the punctuation.

CORRECTED: In Vienna, Weisbach studied mathematics, physics and mechanics.

QUES: Who was in the car on the crime scene Analyze the video and pick the criminal from the list of suspects

correct the punctuation.

CORRECTED:
Who was in the car on the crime scene? Analyze the video and pick the criminal from the list of suspects.