Here are the answers to the fill-in-the-blank sentences based on the provided roots:

1. The gas from the chemical factory was extremely **harmful**. (HARM)
2. D. E. Huges was the **inventor** of the microphone. (INVENT)
3. There are a lot of **traditional** festivals in Vietnam. (TRADITION)
4. They work hard in order to **produce** good crops from poor soil. (PRODUCT)
5. I hope there won’t be too much **difficulty** in getting a work permission. (DIFFICULT)
6. The children are more **interested** in cartoons. (INTERST)
7. Many tourists have been attracted by the **beauty** of Ha Long Bay. (BEAUTIFUL)
8. Designers have **modernized** the ao dai for ages. (MODERN)
9. She divorced him because of his **kindness** to the children. (KIND)
10. They love Thanh Lam because of her **beautiful** voice. (BEAUTY)

If you need any further assistance, feel free to ask!