阅读短文,回答问题
Your English teacher has introduced a play to your class. Read the play.
Characters: Benny, student, 14 years old
Peter, student, 15 years old
Susie, student, 14 years old
Grace, student, 14 years old
Time: One Sunday afternoon in autumn
Place: Sunny Park
(The four teenagers have just finished the picnic. They are tidying up.)
Benny: Wow! That was a great picnic. I'm so full that I can hardly move.
Grace: That's no excuse for not tidying up, Benny. Come over here and help me pack up the leftover food. Peter, can you put out the fire, please? And clean up the place.
Peter: (Speaking unhappily to himself) How can I always get the dirty and difficult jobs? It's not fair.
(Peter throws a bit of water on the fire. Then he picks up the ashes (灰烬) with an old newspaper and wants to throw them into the long grass.)
Susie: (Sounding surprised) What are you doing, Peter? That's d...
Peter: Whoops... the paper has caught fire.
Susie: And the grass... Benny, Grace, help! Help!
(Benny and Grace come over quickly. They help put out the fire completely.)
Peter: Oh, no. What have I done?
Grace: You know that we should do everything carefully, don't you?
Peter: (With his head in his hands) Yes. What have I done? What have I done?