The home environment was a topic of conversation before Game 5.

The topic of conversation all night long was, Who is going to be the 43rd?

Soon enough the topic of conversation turned to my social life.

They seem to be a popular topic of conversation these days.

Now was the time for the last topic of conversation.

You could tell a lot about a society by what topics of conversation came up.

What might have happened to him became a hot topic of conversation.

But to get back to our original topic of conversation.

It was time to get back to the main topic of conversation.