How do you use the word rarefy in a sentence?

(The words may be part of separate clauses, or the letter I could specifically refer to the letter of the alphabet. Otherwise, the proper conjugation is "am.")Examples:The one that I like the best is...

"I would like to return the gift you gave to me." "I understand you are trying to help me." "I don't get why this is always happening to me." I really hope that aunt shelly will get ME a great gift...

Examples : "Bill was puzzled by the unfamiliar word in the quotation." "He honored the contract because he had given his word.""Word is a word."

(verb) The photographer will use his camera to take many pictures. We use chocolate syrup to flavor our milk. The neighbor wants to use our lawnmower this afternoon. Since we're out of milk I'll use...

The hotel desk clerk was not able to find my reservation, so I took my business elsewhere.