Заполнить прописки соответствующими предлогами at,in,for,of,on

Привет! Давай решим это задание вместе и подставим подходящие предлоги.

1. We studied English at school.
2. We have three lectures on Monday.
3. I study in the faculty of Economics.
4. The speciality of an economist is very important for the economy of our country.
5. He was not present at the lessons yesterday.
6. The system of distance education for different people allows them to get higher education.
7. He is a good specialist in marketing.

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