Read the following paragraph and underline the topic sentences.
A mirror can often make a small room seem larger. A friend of mine has a living room that measures about eight feet by ten, but that looks twice that size, because one entire wall is covered with mirror tiles. The furniture and pictures in the rest of the room are reflected in the mirror wall, making it look like a large extension of the entire room. Using mirrors is an effective decorating technique.
A mirror can often make a small room seem larger.