Sure! Here’s a rewritten version of the sentences:

**Exercise 5: Rewrite the sentences.**

21. If you read a lot of books, you will gain more knowledge.
-> **The more**

22. He talks excessively, which makes others feel bored.
-> **The more**

23. The expansion of the economy improves people's living conditions.
-> **The more**

24. People discover many things as they travel longer distances.
-> **The farther**

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**Exercise 6: Circle the correct answer.**

1. Cattle usually cross the road. You should drive **more carefully**.
2. Life in some parts of the country is **more boring** than in others.
3. The elderly typically rise **earlier** than the young.
4. An ox doesn’t plough **better** than a buffalo.
5. These 7 thinking habits will help you become **more confident**.
6. Don’t worry. The river is not **as deep** as it appears.
7. After a hard day’s work, you may sleep **more soundly** than usual.
8. My father has been **more healthy** since he quit smoking.
9. The air in mountain regions is **fresher** than in the cities.
10. I can't comprehend. Could you ask him to speak **more clearly**?

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**Exercise 7: Write the comparative form of the adjective or adverb in brackets. Use "than" where necessary.**

1. A cellphone would be a **more useful** present.
2. It's a long way from here to the station **farther** than I thought.
3. Can't you think of anything **more intelligent** to say?
4. It was **busier** than usual in town today.
5. Unfortunately, her illness was **more serious** than we thought at first.
6. Health and happiness are **more important** than money.
7. You need to draw it **more carefully**.
8. I like living in the country. It's **more peaceful** than living in town.