根据短文内容，将方框中的选项填入短文中，使短文内容完整。
A young man and an old man are walking in the park．The old man is behind(在后面) the young man． ___ The old man is very glad to see the chair．He wants to sit on the chair for a rest（休息）．The young man walks to it，too．
Now he is in front of(在前面) the young man．The young man says．“
” The old man doesn’t listen to him．He is sitting on it．He looks happy：The young man comes over to him．He is holding a small board(木板)in his hand．It says，“
”
| A．Wet Paint.(油漆未干) |
| B．There is a chair in front of (在…前面)the young man. |
| C．Don’t sit on the chair! |
| D．So he begins(开始) to run. |
（water，now） 
（clean，tomorrow） 
（run，fast）．