Как правильно ? at the lesson или on the lesson

swim   run   sing skip swim jump cockereles sing

софи was from france. she is in egypt now. she wants to study a history of egypt. софи has gone to travel on all country. she saw the big pyramids the last week. софи long prepared to go on camels much. but she has not taken means from mosquitoes to sleep in tents. she wanted to meet many interesting people. софи has found many new friends. she has had time to buy many gifts and has made many photos.