Answer:
1. "Open your mouth and stick out your tongue," Dr. West said.
2. Mario's plane ticket to Florida costed less money than mine.
Step-by-step explanation:
Since the first sentence has dialogue in it, the words said by Dr. West need to be surrounded by quotation marks, and since the punctuation would be a period, it is switched to a comma, because there is explanatory text after the dialogue (Dr. West said). It is important to note that the comma (or any form of punctuation at the end of any sentence when dialogue and quotation marks are present) goes inside the quotation marks. "You" refers to a person, while "your" is the possessive form of "you" - indicating that what is being spoken about belongs to 'you'. "You're" and "your" are very commonly confounded, the meaning of "your" is explained above, "you're" is the contracted form of "you are". In this case, the tongue belongs to the person deemed as "you" thus you would say "your tongue", not "you're tongue" (the latter would mean you are tongue).
The second sentence incorporates the possessive form of Mario, indicating that what is being talked about belongs to Mario (in this case, the plane ticket). The way it is written in the given sentence, "Marios", implies that there are multiple people named Mario that are the subject of the sentence. Where it says "plain ticket", what is meant is definitely an airplane ticket - not a ticket to go to the plains. "Plains" and "planes" are also commonly mixed up, the first one being somewhat synonymous to fields, and the second being airplanes, those large machines that fly above our heads faster than we can imagine. The word "lesser" would only be used when referring to quality, and "less than" is used when speaking of quantity.
Hope this helps!