Your Answer: Mexico, where sports are popular, has hosted the Olympic games and the world cup.
The topic sentence introduces the reader to what you will talk about.
B. They announce the main ideas of paragraphs
An unabridged English-language dictionary is a shortened dictionary for everyday use, and it is the dictionary that most people have in their homes and offices.
To create a better image in the reader's mind. The use of imagery creates a better picture when the reader imagines the setting. Since when reading everyone thinks of a different picture imagery helps to create a picture closer to what the author imagined.