let's try to spend less time on technical details!

Dear Victor, I can't express the gratitude that I have to the heart of this wonderful resource! I tank you again and want to suggest some things that I would really like to use here. Can we copy all the boxes on the page by some combination of keys? I have two mistakes in my worksheet and I want to fix them but I can't change background if I have saved it even once. What can I do? Can we have some ready made templates where a certain type of exercises are present? It will really boost the productivity. Thank you in advance! Larysa