Explanation: The rule for indefinite article usage is as follows: Use before nouns (or adjectives) that start with a consonant sound. Use before nouns (or adjectives) that start with a vowel sound.
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Answer:
8. The dogs kept barking last night <u>even though</u> there seemed to be no one outside.
9. The bus arrived late <u>because</u> the traffic in EDSA was at a standstill.
10. She was baking a cake <u>when</u> the oven malfunctioned.
Explanation:
I simply added a subordinating conjunction to one of the independent clauses.