根据对话内容。在空白处填上适当的话语（词、短语或句子）。

A: Michael, do you like sports?

B: Of course I do. Sports are for our health.

A: What's your favorite sport?

B: Football.

A: How often do you play football?

B: Four times a week.

A: I don't like sports at all.I like watching TV.

B: How often do you watch TV?

A: I watch TV every day.

B: Really?

A: Three hours.

B: Watching TV too much is bad for your eyes.

A: You're right. Maybe I should .