Составить специальные вопросы к предложению(общий, альтернативный, разделительный, специальный , вопрос к подлежащиму) вот предложение: the aim of the students expedition was to explore the flora and fauna of their native land and learn more about practical ecology. заранее : 3

The aim of the students expedition was to explore the flora and fauna of their native land and learn more about practical ecology.
1) Was the aim of the students expedition to explore the flora and fauna of their native land and learn more about practical ecology?
2) Was the aim of the students expedition to explore the flora and fauna of their native land and learn more about practical or theoretical ecology?
3) The aim of the students expedition was to explore the flora and fauna of their native land and learn more about practical ecology,wasn't it?
4) What was the aim of the students expedition?
5) к подлежащему не получается: