Answer:
Becoming addicted to the Internet can produce several psychological effects.
Step-by-step explanation:
The topic sentence contains the main idea of a paragraph, so it says what the paragraph will be about. In that matter, the topic sentence represents the summary of the paragraph, while the following sentences provide evidence, explanation and examples to support it. In this case, the rest of the sentences after the topic sentence will describe, analyse and illustrate the psychological impact of Internet addiction.