根据材料内容选择最佳答案。
On a summer weekend, Mike and his brother Sam went to a pet shop. They wanted to buy a birthday gift for their sister, Anne. There were birds, dogs and cats there. They bought a cat at last. They thought it was so cute. Anne must like it.
On their way home, Mike and Sam saw a small river. There were lots of fish in the river.
"We can catch (抓) a fish to make dinner for Anne, " Mike said.
"▲" Sam said.
Mike and Sam had good luck and caught a big fish. They were very happy with the fish and took it home. They were ready to cook the fish for dinner.
But then, Anne came home and saw the fish.
She was very sad. "Why did you bring the fish back?" she asked.
"Don't you want to have a good dinner?" asked Sam.
Anne felt so angry. "No. The fish's home is in the river and its family is there, too, " she said. "You shouldn't bring it home. "
The two brothers loved their sister. They thought about what she said. "Don't worry. We will take the fish back to the river, " Mike and Sam said.
Anne went with them. The fish seemed (似乎) happy too as it swam away. Now, Anne had a big smile on her face.
