Passed and past are often confused.
Common Errors in English has an excellent entry regarding this:
You can see more at: http://commonerrorscalendar.blogspot.com/
Today’s Assignment: Include Art AND Creative Writing in your project today.
How about including something like this?
More great ideas at Dot and Bo:
1. Make a tepee. (Could be diorama-sized.)
2. Write a play. (This can be co-curricular: History and Composition).
3. Organize a performance of the play for an audience.