QUESTION: Fix punctuation: And the experience of all capitalist countries old and new year by year demonstrates clearly the truth of this Marxian doctrine to increasing numbers of workers
ANS: And the experience of all capitalist countries, old and new, year by year demonstrates clearly the truth of this Marxian doctrine to increasing numbers of workers.

QUESTION: Fix punctuation: Unsure about which type of X1 file you have Do you want to know exactly what it is who created it and how to open it
ANS: Unsure about which type of X1 file you have? Do you want to know exactly what it is, who created it, and how to open it?

QUESTION: Fix punctuation: Dilatation and accumulation of secretions perpetuates lung damage invite infections to settle and compromise the lung functions in patient
ANS: Dilatation and accumulation of secretions perpetuates lung damage, invite infections to settle, and compromise the lung functions in patient.

QUESTION: Fix punctuation: We have warehouses in North America and Europe but unfortunately they do not carry all of our products
ANS:
We have warehouses in North America and Europe, but unfortunately they do not carry all of our products.