Here are the correct forms of the words for each blank:

1. I have finally **completed** my research paper. (COMPLETION)
2. The child was **punished** for misbehaving in class. (PUNISHMENT)
3. The old man **suffered** from chronic back pain. (SUFFER)
4. The recipe calls for a variety of fresh **ingredients**. (INGREDIENT)
5. Public speaking can cause **anxiety** in many people. (ANXIOUS)
6. The dancer moved with **effortless** grace. (EFFORT)
7. It is important to dress **appropriately** for the occasion. (APPROPRIATE)
8. Pasta is not as **fattening** as people think it is. (FATTEN)
9. The whole town gathered for the **celebration**. (CELEBRATED)
10. Effective **communication** is key to building strong relationships. (COMMUNICATION)