Here are the correct word forms for the exercise:

1. She's **busy** now – can you phone later? (busily)
2. Most of us like the **convenience** of using credit cards to buy things. (convenient)
3. Many **famous** people have stayed in the hotel. (fame)
4. It's a **fantastic** place, really beautiful! (fantasy)
5. Other meteor storms have occurred in recorded **history**. (historic)
6. The knife had pierced his heart, but **incredibly** he was still alive. (incredible)
7. He lived in a **fantastic** world of his own, even as a small boy. (fantastic)
8. Monday's a bit **inconvenient** for me. How about Wednesday? (convenience)
9. Why do you **like** her so much? (like)
10. My secretary will call you to arrange a **convenient** time to meet. (convenience)

Feel free to ask if you need further assistance!