The coordinating conjunctions that must be added in the first, second, and third sentences are, respectively, "however," "but" and "then."
We can arrive at this answer because:
- Conjunctions are words that can link two clauses of a sentence.
- These conjunctions are called coordinative when they link two clauses with the same grammatical function.
- In this case, the use of conjunctions allows the text to flow and promote a meaningful reading.
In the case of the sentences shown in the text above, the conjunctions presented in the first two sentences have a sense of opposition, while the last sentence has a sense of addition.
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