Answer:
1. Hard
2. slow
3. angry
4. quietly
5. commonly
6. brave
7. brightly
8. stressful
9. fast
10. generous
Step-by-step 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."