Fill in the gaps with suitable prepositions or adverbs where necessary: 1. the plant's operators decided to reactor. 2. people's earnings a wide factors. 3. this trend will raise a issues the economic the country. 4. huge the technologies have substantially facilitated the production process. 5. the invention the 15th century completely changed the world 6. the deal involved the forty new the airlines. 7. the town was a flourishing seaside destination.