Q1: Punctuate the following paragraph. 10?

the central thought or main controlling idea of a paragraph is usually conveyed in what is called a topic sentence this crucial sentence which states summarizes or clearly expresses the main theme is the keystone of a well-built paragraph the topic sentence may come anywhere in the paragraph though most logically and in most cases it is the first sentence this immediately tells readers what is coming and leaves them in no doubt about the overall controlling idea in a very long paragraph the initial topic sentence may even be restated or given a more significant emphasis in its conclusion