It would better improve the paragraph because it has nothin to do with the rest of the paragraph. The paragraph seems to be about team sports and promoting it, while sentence 3 is about individual sports are better then team sports. So removing sentence three would better promote CO-ED team sports.
The following answers use correct punctuation: (a) Dear Ms. Collin: When the error message appears on the screen, you should exit the program, right. (b) When you leave at 5:00 p.m., please shut the door and lock it; however, do not set the alarm.
In sentence (c) the punctuation in 1980's is not correct. It is a common mistake to include apostrophes when pluralizing a number or an abbreviation. Apostrophes are generally used in contractions and to indicate the possessive case.
In the poem, My Old Man, by Charles Bukowski, the speaker is a disturbed man. At only sixteen years old, he is already into drinking alcohol as a means of coping with depression and abusive father.
hope it helps