5. B - subordinating conjunction AFTER begins a dependent sentence.
6. B - subordinating conjunction IF begins a dependent sentence.
7. A - Sentence with complete idea, stands on its own.
8. B - AND unites two independent sentences.
9. B - THAT (WHEN, subordinating conjunction). Capital letters reveal a creative person, WHEN (they) are inserted in the middle of a word.
10. A - Sentence with a complete idea.