You were absent from school for 2 weeks because of some kind of sickness. When you came back, you had to give in your history assignment. That day you didn't have any classes with your history teacher so you went to his office after your lessons ended. You knocked on his door.

He is sitting in his chair, reading thru other assignments. He looks up from the pile of papers and with a deep voice, he speaks up

"You can come in"