QUESTION: Fix punctuation: Boot sector Virus The most probable reason behind MBR corruption may be boot sector virus
ANS: Boot sector Virus: The most probable reason behind MBR corruption may be boot sector virus.

QUESTION: Fix punctuation: The tunnel will comprise 89 tunnel elements and two portal buildings connecting it with land in Denmark and German 79 of the elements are 217m long 42m wide and 9m high
ANS: The tunnel will comprise 89 tunnel elements and two portal buildings, connecting it with land in Denmark and German. 79 of the elements are 217m long, 42m wide and 9m high.

QUESTION: Fix punctuation: Researches at universities in the United States show how the presence of a fish tank causes a distinct well being particularly with the elderly
ANS: 'Researches at universities in the United States show how the presence of a fish tank causes a distinct well being, particularly with the elderly.

QUESTION: Fix punctuation: 74 electric hookups with CEESockets 316 amps
ANS:
74 electric hook-ups with CEE-Sockets (3-16 amps)