Remember that a topic sentence is a complete sentence and is neither too general nor too specific. Step 1 Read the sentences in each group, and decide which sentence is the best topic sentence. Write best TS (for "best topic sentence") on the line next to it. Step 2 Decide what is wrong with the other sentences. They may be too general, or they may be too specific, or they may be incomplete sentences. Write too general, too specific, or incomplete on the lines next to them. The first one has been done for you as an example. Group 2 ________ a. The history of astronomy is interesting. ________ b. Ice age people recorded the appearance of new moons by making scratches in animal bones. ________ c. For example, Stonehenge in Britain, built 3500 years ago to track the movement of the sun. ________ d. Ancient people observed and recorded lunar and solar events in different ways.