1. Some people become _______. A. richer and richer B. richest and richest C. more and more rich D. more rich and richer
2. The tests are _______. A. more difficult and difficult B. more and more difficult C. more difficult and more difficult D. more difficult
3. Life in the modern world is becoming _______. A. more complex B. complexer and complexer C. more complex and complex D. more and more complex
4. Because he was afraid, he walked _______. A. farther and farther B. faster and faster C. more and more fast D. more faster and faster
5. The living standard is getting _______. A. gooder and gooder B. more and more well C. better and better D. more better
6. The _______ you study, the more you will learn. A. hardest B. harder C. most D. much