2- Cell phones have changed the way we communicate . 3- Using a cell phone while driving can be dangerous . They can be regarded as topics sentences with key words.
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Anonymous 1- Owning an automobile is necessary for me.2- Cell phones have changed the way we communicate. 3- Using a cell phone while driving can be dangerous.They can be regarded as topics sentences with key words. We normally have a topic sentence in a paragraph, not in sentences.