I need to revise these sentences.

Can you please help me?

1) What music instrument do you play?
Which music instrument do you play?
2) When does their show start?
What time does the show start?
3) Do you have a lot of fun?
You always talk around. (What does "talk around" mean?)
Can you switch off the TV? I'm trying to hear.

1. musical instrument

2. OK

3. Talk around means to talk, but avoid talking directly about the subject.
http://idioms.thefreedictionary.com/talk+around

4. OK