When answering this question, you can talk about the different categories of items that are commonly found in museums. For example, museums often keep historical artifacts, artworks, fossils, scientific specimens, and cultural relics. You can also mention that some museums focus on specific themes, like natural history, technology, or local culture, so the things they keep can vary a lot. Giving examples, like ancient pottery, paintings, dinosaur bones, or old tools, can make your answer more vivid and clear.