Ответ:

1. mustn't

2. mustn't

3. must

4. must

5. must

6. mustn't

7. must

8. mustn't

9. mustn't

10. must

short - shorter- the shortest

tall - taller - the tallest

young - younger - the youngest

beautiful - more beautiful - the most beautiful

good - better - the best

fast - faster - the fastest

expensive - more expensive - the most expensive

bad - worse - the worst

difficult - more difficult - the most difficult

little - less - the least

Объяснение: