Here are the completed sentences with appropriate words filled in:

1. **The building has got egg **shapes**.
2. It was two months since he last **appeared**. We were very surprised because he **disappeared** without saying a word.
3. His **appearance** was a secret because nobody knows where he was.
4. People believe that there are some **creations** from outer space.
5. The crows like something **sparkly**.
6. My **physical** condition got worse, so I feel exhausted.
7. The dress matches with this pair of shoes **perfectly**.
8. I always expect a **marvelous** outcome and then I realize that there is nothing **marvelous**.
9. This story is **imaginary**, it isn’t real.
10. She always has lots of new ideas. She is an **imaginative** person.
11. Police has been looking for a young man. He disappeared **mysteriously**.
12. **Mysterious** creatures just appear in the legend. They are imaginary.
13. Two ways to save energy are energy **conservation** and energy efficiency.
14. This book is very **informative**. I can’t put it down.
15. I need to shop some **appliances** for my new house.
16. Humans will deal with more and more **environmental** problems in the future.
17. He **achieved** his goals last month and his **achievement** made him proud.
18. Plastic bags are hard to be **dissolved**.
19. Bottles and cans can be **reused**.

Feel free to ask if you need additional help!