The fist answer should be the right one
Answer:
1. Hard
2. slow
3. angry
4. quietly
5. commonly
6. brave
7. brightly
8. stressful
9. fast
10. generous
Explanation:
Adverbs: describe the action that is happening. In number four, the children are PLAYING quietLY. Adverbs add the "LY" at the end of a describing word.
When you are just describing a noun, you don't need to add the "LY." So in number 2, you are describing the internet connection (a thing) and you would just say it is "slow" not "slowly."
This is a complete sentence.