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: