What should I do??

1. Go back and get it.

2. Call someone for the assignment.
3. Go online to see if the textbook/workbook is available, IF the homework was from one of those 2 things.
4. Write yourself a big note so you will never forget again.

Sra

i do that all the time

To help answer your question, I need more specific information about the situation or problem you are facing. Could you please provide more details or context so that I can offer you relevant advice?