One possible version:
Last week I took part in a farm work programme in the suburbs.
At the class meeting, our teacher told us about the programme with the theme “Working is most beautiful”. And he stressed the importance of working with our own hands.
When I got home, I packed up my luggage for the trip.
On the farm, we helped pick watermelons. While working, I realised how hard it was to work in the fields under a hot sun.
When I came back home, I shared my experiences with my parents. And they were very proud of me.