Question

Which of the following punctuates dialogue properly?

"It's been fun," she said. Don't you agree?
"Yes. It's been a blast, he said."


"It's been fun," she said. Don't you agree? "Yes. It's been a blast, he said."

"It's been fun," she said. "Don't you agree?"

"Yes. It's been a blast," he said.

"It's been fun," she said. "Don't you agree?"

"Yes. It's been a blast, he said."

Answer 1

"It's been fun," she said. "Don't you agree?"
"Yes. It's been a blast," he said.

Answer 2

The correct dialogue is: 
"It's been fun," she said. "Don't you agree?"
"Yes. It's been a blast," he said.

The "Don't you agree should be in quotation marks because she is still talking to him.