Write sentences from Exercise 6. Use object pronouns hate doing homework but my partner doesn't mind сделаю лучшим ответом

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:

fine - finer - the finest      good - better - the best     new - newer - the newest    foreign - more foreign - the most foreign       straight -  straighter - the straightest     narrow - narrower  - the narrowest  (но возможно и с more и most)  heavy - heavier - the heaviest     young - younger - the youngest     bright - brighter - the brightest     bad - worse - the worst     poor - poorer - the poorest      dark - darker - the darkest      little - less - the least   old - older - the oldest (old -elder- the eldest)  far - farther / further - the farthest / furthest      interesting - more interesting - the most interesting      comfortable - more comfortable - the most comfortable       different - more different - the most different       early - earlier - the earliest      readable - more readable - the most readable      near - nearer - the nearest   quiet - quieter/more quiet - the quietest/  the most quiet    high - higher - the highest     crowded - more crowded - the most crowded      wide - wider - the widest    pleasant - more pleasant - the most pleasant