Locate keywords from the topic sentence in the rest of the text. If you know the keywords in the topic sentence, then it will be easy to find the main idea, as these keywords will be repeated throughout the passage. To find the keywords, search the passage for repeated words and phrases. These words and phrases are likely connected to the main idea. Keywords are usually dates, names, places, or other nouns. Passage: Tornadoes are extreme weather events found in nature and come in a variety of shapes and sizes. Waterspouts are known to form over bodies of water, often in tropical areas close to the equator. These tornadoes are connected to a large cumulus or cumulonimbus cloud. They are shaped like funnels which appear as twisting pillars of air. There are other better-known types of tornadoes such as the landspout and the multiple-vortex tornadoes. 86. Which title best summarizes the main idea of the passage? A. Types of Tornadoes C. Multiple-Vortex Tornadoes B. Landspout Tornadoes D. Cumulus and Cumulonimbus