Complete with the correct preposition: 1.The phenomenon was observed ___ the Mid...

Questão de Inglês da banca GS Assessoria e Concursos (2021). Confira a resolução completa abaixo:

Complete with the correct preposition:
1.The phenomenon was observed ___ the Middle Ages. 2.I was waiting for him ____ St. James Square. 3.They married ___ Christmas Day. 4.We are going to spend our vacation ____the West coast.
The correct order is: