QUES: Cover and cook on low for about 68 hours

correct the punctuation.

CORRECTED: Cover and cook on low for about 6-8 hours.

QUES: This device of advancing under cover which is still basic in Communism today was the guiding principle If only the aim is achieved it does not matter under what cover it takes place and a cover is always necessary

correct the punctuation.

CORRECTED: This device of advancing "under cover" (which is still basic in Communism today) was the guiding principle: "If only the aim is achieved, it does not matter under what cover it takes place; and a cover is always necessary.

QUES: Will have free upgrades of Clickris 4

correct the punctuation.

CORRECTED:
Will have free upgrades of Clickris. 4.