For measuring the mass of a shoe, piece of paper, book, and tissue, the most appropriate unit of measurement would be Gram.
- Milligram is typically used for very small weights (like medicine).
- Ounce is often used in cooking and for lighter objects but is less common in scientific contexts.
- Kilogram is suitable for heavier objects, like a shoe or a book, but might be too large for lighter items like paper and tissue.
Therefore, grams provide a good balance for all the items in question.