Sarcasm vs serious

Is this sarcastic or serious: You have to go to the mall but you don't like shopping. "I can't wait to go to the mall today."

Is this sarcastic or serious: You are going to the mall after school and love shopping! "I can't wait to go to the mall today."

Is this sarcastic or serious: The weather is cold and rainy. "What beautiful weather we're having"

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