Two men are walking in the park. One is Mr Brown, a worker, the other is Mr Black. Mr Brown is going to a chair. It is beside the road. Mr Black is behind him. Mr Brown finds Mr Black. Now Mr Black begins to walk faster, because he wants to get to the chair before Mr Black. Now Mr Black begins to walk faster because he also wants to get to the chair first. Then they both run .Mr Black runs faster than Mr Brown. So he gets to the chair first and sits down on it. Mr Brown runs after Mr Black. When he gets to the chair, he sees Mr Black sitting on it. He is sorry to show a notice with the words "Wet Paint" to Mr Black . Now Mr Black knows why Mr Brown is going to the chair. Mr Brown goes to the chair because  _  .
he wants to sit there it is his chair he wants to talk to Mr Black on the chair he wants to tell people "Wet Paint"