Final answer:
The question provided sentences requiring appropriate punctuation. Corrected sentences account for possessive apostrophes, contractions, and the addition of question marks to denote interrogative form.
Step-by-step explanation:
The sentences provided require correct punctuation, mainly the use of apostrophes and question marks where necessary. In each sentence, apostrophes are added to show possession or to create contractions, which are shortened forms of words that combine and omit certain letters. Question marks are included at the end of interrogative sentences.
Corrected Sentences
- Dehradun is a lovely hill station, isn't it?
- Jack's and Jill's hill is nothing more than a mound of dirt on the southwest corner of Farmer John's land.
- One's labor is proportional to one's wealth.
- George shouldn't say that he'll be in the library when he obviously won't.
- I'll be back.
- Who'll referee those kids' soccer game if not for your brother?
- Mrs. Nakamura considers her hometown beautiful.
- Before setting out on the road trip, I put air in my tires.
- Joyce gave her father a gift card for Christmas.
- He hadn't broken his promise.
- The voters elected Mr. Thompson mayor.