4. Archie knew the man that introduced himself, looked him in the eye and smiled, and he decided there was nothing to loose by letting the man take a bite of his sandwich.

Ans.

Archie knew the man who introduced himself, looked him in the eye, and smiled, and he decided there was nothing to lose by letting the man take a bite of his sandwich.

1) "Who" must be used instead of "that" when a relative clause relates back to a person. [Score 1 pt.]

2) The comma after "eye" must be included because this is a series of verbs, and the comma should be included between the last and the second-to-last item in a series. [Score 1 pt.]

3) Misusage—"Loose" is the wrong form. "Lose" is the correct form. [Score 1 pt.]