1:What colour is ...the.. floor in your room?
2:Write ...a/the... question on ...the.. blackboard, please.
3:Please open ..the.. window.
4:Please close ..the.. door.
5:Are you writing ..- / the... new words?
6:Is he giving you ..a... piece of ..... chalk?
7:Where's ...the.. chalk?
8:Where's ..... Room Six?
9: ..The... exercise-book is on ...the.. table.