Here are the completed texts:
Nikki, aged 16
I go to the park with my friends. We 1 play the guitar there. We always 2 have a good time. Mick and Sam 3 play the drums - African drums. They're really cool but some people in the park don't like them!
Molly, aged 16
I 4 go to a shopping centre with my friends on Saturdays. We usually 5 go to the cinema on Saturday evening. Sunday is great! We 6 play basketball and we 7 have a lot of fun together!
Bruce, aged 17
I don't have much free time, but I 8 go out with friends when I can. Saturday is a good day for one of my friends to 9 have a party because I'm usually free in the evening. On Sundays, I 10 play chess. It's a great game. I don't 11 play video games because I don't enjoy them!