Items #4 and #5 are correct. Here are corrections for #1-3.
- Move the period outside the parenthesis. Periods go outside the parenthesis when the enclosed matter comes at the end of another sentence and is not a complete sentence itself. The graduation speaker was not observant enough to notice the many signs of boredom throughout the audience (yawning, dozing, playing “Angry Birds”).
- Move the period inside the parenthesis because the enclosed matter is a complete sentence and comes at the end of another sentence. The graduation speaker was putting everyone to sleep. (His topic was Paradigms of the Future in a Global Economy.)
- When the enclosed matter is a complete sentence and is inserted in the middle of another sentence, the enclosed matter is not capitalized, and no punctuation is used at the end—unless the enclosed sentence requires a question mark or exclamation point. The graduation speaker (he was Dr. Arlington Keller) was boring everyone to death with his uninspired topic, Stuff I Think.
