Sounds familiar...Betting?
The main purpose of a keyword search is to D. find only those results that relate to your topic. It's quite obvious really. If you place a keyword in a search engine, the goal would be to find sources that relate to the word you typed in. Thus, your answer is D.
Answer:
a.
Explanation:
b isn't even a sentence, in c it would have to be "the smiths'", c would have to be should've to make sense.
Answer:
It could be that the feud is so longstanding that the families themselves don't know why it started. The Montagues have always hated the Capulets and vice versa.
Explanation:
Good luck with your assignment! :)