Superative with "the or without the "-"

1. Everest is highest mountain in the world.
2. Who is oldest person in your family?
3. This dress was cheapest.
4. Which language do you think is easiest to learn?
5. This book is  most serious one on the topic.
6. I think that one over there is  strongest horse.
7. This film is shortest.
8. She’s  fastest runner in her school.
9. That suitcase is  lightest.
10. Out of all  cities in Europe, London is  biggest. 

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