

Tom and Lily are friends. They like to play in the park. One day, they see a big dog. The dog is brown and fluffy. He has a red collar.
"Can we pet the dog?" Lily asks Tom.
"Let's ask the owner first," Tom says. They see a man sitting on a bench. He is reading a book. He has a leash in his hand.
"Excuse me, sir," Tom says. "Can we pet your dog?"
The man looks up and smiles. "Sure, you can," he says. "His name is Rex. He is very friendly."
Tom and Lily go to Rex. They say hello to him. Rex wags his tail. He licks their faces. Tom and Lily giggle. They pet his fur. They give him a rub on his belly. Rex rolls over and makes a happy sound.
"Rex likes you," the man says. "Do you want to give him a treat?"
"Yes, please," Tom and Lily say.
The man takes out a small bag from his pocket. He opens it and gives them each a biscuit. They hold the biscuits in their hands.
"Say 'sit', Rex," the man says.
"Sit, Rex," Tom and Lily say.
Rex sits down. He looks at them with his big eyes.
"Give him the biscuit," the man says.
Tom and Lily give Rex the biscuit. Rex takes it gently. He crunches it in his mouth. He licks his lips. He looks at them again.
"Say 'good boy', Rex," the man says.
"Good boy, Rex," Tom and Lily say.
Rex barks. He jumps up and down. He wags his tail.
"Thank you, Rex," Tom and Lily say.
"Thank you, sir," they say to the man.
"You're welcome," the man says. "Rex likes to make new friends. He thinks you are very nice."
Tom and Lily smile. They hug Rex. They say goodbye to him and the man. They go back to play in the park. They are happy. They think Rex is a wonderful dog. They think his biscuit is delicious.
