Fill in the gaps with suitable prepositions or adverbs where necessary:
1. The plant’s operators decided to shut ___ the reactor.
2. Differences ___ people’s earnings depend ___ a wide
variety ___ factors. 3. This trend will raise a number ___ issues
relating __ the economic concerns ___ the country. 4. Huge
advances ___ the development ___ technologies have
substantially facilitated the production process. 5. The invention
___ printing ___ the 15th century completely changed the
world. 6.The deal involved the supply ___ forty new aircrafts
___ the airlines. 7. The town was turned ___ a flourishing
seaside destination.

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