Sure! Here are the completed sentences with the correct forms of adjectives or adverbs:

1. Some people think that health is **more important** than money. (important)
2. The pollution in our city is much **worse** than it used to be. (bad)
3. My new teacher explained the lessons **more clearly** than my old teacher. (clear)
4. He doesn't play volleyball as **well** as his brother. (good)
5. Get rid of the sorrow! You will do it **better** next time. (good)
6. Communication is a lot **easier** than it was 50 years ago. (easy)
7. People in rural areas wear **simpler** clothes than those in cities. (simple)
8. Robert arrived at the meeting **later** than Francis. (late)
9. These trousers are too wide. Do you have any that are **narrower**? (narrow)
10. My mother always gets up **earlier** than everybody else in the house. (early)
11. Trang speaks **more fluently** than the other ESL students in the class. (fluent)
12. Can't you think of anything **more intelligent** to say? (intelligent)
13. I think his new book is much **more boring** than his last one. (boring)
14. Max finished his homework **faster** than anyone else in the class. (fast)
15. He doesn't look as **happy** as he used to. (happy)

Let me know if you need any further assistance!