"Come on now—don't act like Sir Render!" Gavin said in his whiniest voice. "Like a knight who gives up so soon."​ That hurt Teresa's feelings more than Gavin thought it would. To Gavin, harmless jokes were not serious. To Teresa, mean words were simply mean.

"I thought you would always have my back," Teresa spoke with tears in her eyes. "Why would you make fun of me when I need you the most?"​

Gavin was alarmed and sat up straight on the couch. Surely it is not that serious, he thought. ​"Tell me why you are so upset about a little joke?" Gavin asked his little sister. He couldn't understand her reaction at all. But he felt sorry for her. In fact, he felt bad about all the times he teased Teresa. Gavin decided today was the day he would say sorry. Better late than never, he remembered his mother's words and spoke gently. "Listen, I am sorry. I forget that you don't like my teasing you. You know I am just playing with you. Tell me what the real problem is, my baby sister."​

Teresa flung her arms and hugged her big brother. Then, she sobbed. Gavin patted his sister's back and held her without saying a word. ​

"So, what is it?" Gavin finally asked. ​

"The girls at the camp said mean things," Teresa said, "and I ran out before giving my presentation."​

"Don't let them give you more reasons to be mean," Gavin advised. "I mean—if you run from your work, they will call you more names. Tomorrow, ask the teacher to let you give the presentation. Hang out with people who are nice to you. Ignore those fools!"​

Teresa was surprised at how nice her brother was being. "Do you know you can give good advice?" She smiled.​

"I guess I can if I try," Gavin said as he released his sister from his hug. "Don't get used to it."​
Problem:
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Which sentence or sentences from the passage use pun?​
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"Come on now—don't act like Sir Render!" Gavin said in his whiniest voice. "Like a knight who gives up so soon."​
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Better late than never, he remembered his mother's words and spoke gently.​
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"Don't let them give you more reasons to be mean," Gavin advised. ​
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Gavin was alarmed and sat up straight on the couch. ​