Create Sight Singing Exercises

Hi!

I would like to create some basic sight singing exercises. How can make 10 short examples that are not in continuous music, but in separate chunks. For example

1. Sight singing example one, around 8 measures.
2. Sight singing example two, around 8 measures.
3. Sight singing example three, around 8 measures.

Right now I've just been making it one continuous piece of music and dividing it up with double bars. It would be easier to read if each line was a different example. Any ideas on how I can do this?

Thanks for your help!

Thomas