How can you know that something is written in first person point of view?

She liked ice cream, but he liked cake. So they bought both.

A personal narrative is written in ______ person point of view.

Which point of view is the following:
"There is one mirror in my house. It is behind a sliding panel in the hallway upstairs. Our faction allows me to stand in front of it on the second day of every third month, the day my mother cuts my hair."
_{from Divergent by Veronica Roth}

What point of view is the following:
Cathy leaned into her computer screen with big eyes. She couldn't believe it- she had finally gotten a 100 on her math test! She knew her parents would be proud of her.

Brandon stepped to the pitcher's mound. He held the ball in his mitt and adjusted his fingers on the seams. He could feel the pressure of the moment. It was the ninth inning. His team was up by one. The bases were loaded. "You can do it," Brandon thought to himself, but he felt hesitation in his heart. He stared at the batter. His name was Jimmy. Jimmy could sense Brandon's hesitation. He was going to capitalize on it. Jimmy knew that Brandon was going to throw it down the middle. He couldn't wait to take a swing. This was Jimmy's chance to be a hero and he had no intentions of blowing it.
What is the point of view?

Rock music was playing through the speakers at the gas station. John jumped out the window of his yellow Jeep without opening the door. As he pumped gas into the Jeep, he danced to the rock music. A girl with blonde hair was walking past. She said, "Wow, partner, you can really move." John tipped his hat to her and winked, and then he continued his performance. John climbed onto the hood of his Jeep and began stomping, shaking his hips, and clapping. Gas overflowed from the tank of the Jeep and spilled onto the ground. John continued to strut his stuff.
What is the point of view?

Time travel is exhausting. It took me 200 million years to realize that. Well, actually it only took me a few seconds, but I first realized it about 200 million years ago. That was the first time that I traveled through time. "Try it!" said the mad scientist. "History needs you," he told me. I went with my gut.
What is the point of view?

"You need to try harder, Kyle, if you want to graduate," Mr. Jenkins intoned. Kyle nodded his head, but he wasn't really listening. He was picturing himself snowboarding down a mountain while Mr. Jenkins lectured him. Somehow, Kyle knew exactly where to put the "uh-huhs" even though he wasn't listening to a word that Mr. Jenkins was saying. "Do you want to graduate, Kyle?" Mr. Jenkins asked.
"Uh-huh," replied Kyle.
What is the point of view?

As you cross the crystal bridge, you hear the sound of two voices coming from the shores of the river. One of the voices sounds distressed. The other sounds angry. At the end of the crystal bridge is a herd of wild horses. You notice that they are stamping the ground violently. If you would like to go to the shore and find out who's talking, turn to page 47. If you'd like to approach the wild horses, turn to page 58.
What is the point of view?

As the train pulled into the station, we finally met eyes. We had been avoiding this moment, but it was here now. Tears welled. Words choked. We hugged each other awkwardly before I grabbed my bags and jumped on the train. A chapter had ended. Things would never be the same between us again.
What is the point of view?

Corman hit the garage door button. There was no response. This frustrated Corman, who hit the button several more times in a fit of rage. Still, there was no response. Kathy said, "Let me try, Corman." Kathy believed that Corman was a clumsy oaf and that he was hitting the button incorrectly. She tested her suspicions by hitting the button gently. The opener whirred and pulled up the garage door. Corman felt embarrassed. Kathy was happy that they would be able to leave the garage now.
What is the point of view?

The Land of Candy spread before me. I licked my lips as chocolate bunnies bounded through the peanut butter fields. I heard the songs of the sour gummy birds in the taffy trees. My tummy rumbled when I saw caramel cobwebs spun by sugar spiders in rock candy caves. I wanted to eat everything that I saw, but Mr. Travis had warned me against that. He said that the elders would view me as a monster if
word got out that I was ravaging the Land of Candy to appease my sweet tooth.
What is the point of view?

Rudy took a bite of the sandwich. Even though he did not like eggs, he knew that eating it would make Marissa happy. It did. Marissa was pleased as punch to see Rudy enjoying the sandwich that she had made for him. "Do you like it?" Marissa asked excitedly. Rudy lied with a big fake smile, "Yup! Eggs are my favorite. This is so good." Nothing could have made Marissa happier.
What is the point of view?

The cafeteria is large but it is crowded. Students sit at every table and there are but a few empty seats. You don't have very many choices, yet the choices you have are important. As a new student at this school, you are being watched by many of the others. Whom you associate with early will affect how the other students will perceive you. The wrong choice could make your life much harder for the next few years. So, what do you do? Here you stand, where do you sit?
What is the point of view?