Answer:
Every driver traveling down this road, every pedestrian crossing this street, every resident of this neighborhood has witnessed the workers' peaceful protest.
Explanation:
Parallelism refers to the use of similar grammatical structures, usually to give emphasis and importance to the words and meanings. In that respect, Lincoln makes use of parallel structures when he repeats the word <em>every </em>followed by a noun phrase, as he makes a list those who were witnesses of the peaceful protests.
A semicolon can be placed where a comma can be placed. My trick is to use this rule; replace the semicolon with a comma.
This leads me to:
B) There have been many accidents during airshows, for example, last year the wind toppled a tent and equipment on top of bystanders.
Let me know if you spot any errors or if this works out :)
Since the ownership is joint, both nouns should get the apostrophe. So, the answer is
Jenny's and Sam's wedding was joyful.
Joint ownership means that both persons have ownership over the same thing. If only one person does, that person should only get the apostrophe.