Ответ:

It was September 1. Jane was very excited. It was her first day in the 5th grade. She woke up at 6 o’clock in the morning and put on a new dress. Her mum made pancakes for breakfast. After breakfast Jane went to school. At school the children talked about their summer. The teacher showed new classrooms to them. Jane was happy to meet her new teacher. They played fun games in the playground. It was one of the happiest days in her life!

Ответ: A — 1, B — 3, C — 3, D — 2, E — 2.

Обоснование: first — порядковое числительное; с точным временем употребляется at; после события в прошлом нужен Past Simple went; после предлога to используется объектное местоимение them; конструкция one of the требует превосходной степени — happiest.