Solution:
- 1. Please keep the dog out of the kitchen - it's not hygienic to have him in there.
- 2. Keep out! The burning building is about to collapse!
- 3. Martha and Kate kept on whispering, even after I had told them to stop.
- 4. Jody was finding it very difficult to keep up with her schoolwork.
- 5. The sign says 'keep off the grass'.
Answer: out of, out, on, up with, off