A topic sentence can be stated or implied. A topic sentence that is stated is a part of a passage that can be found where the main idea or points can be identified. An implied topic sentence, on the other hand, is a sentence that is being made or composed by the reader which cannot be found in the passage.
The italicized word or phrase <em>a three-pronged </em>(if this is italicized, we cannot possibly know) is attributive, as it is an adjective to describe the plan.
The beginning is the central idea of everything written after it.
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Happy homework/ study/ exam!
This lesson is about communication towards the other people from other countries with different beliefs, opinions, way of thinking and speaking. This should be the answer to your question.
