Mystery Envelope - What will it be?

Today we started something new, the Mystery Envelope. Every week Mrs Larsen is going to put something in the envelope she feels needs doing around the classroom. It could be making sure the books are in nice piles, cleaning the clock bay or checking the back door is locked. The boys have 1 week to try and do whats in the mystery envelope. On Friday we open the envelope, see what it was and see if anyone actually did it. The person who does the thing inside the mystery envelope could win a prize. Each week will be different. I wonder who will be first