阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Benjamin Franklin once carried out a famous experiment to prove that lightning was【小题1】form of electricity. He raised a kite with a piece of string, to which a metal key【小题2】(attach). For many years, schools have taught the story of the experiment and more than just one【小题3】(generation) of schoolchildren has been amazed by his bravery and【小题4】(science) approach lo looking for the truth. However, neither the story 【小题5】the details of the experiment are entirely true. Admittedly, fiction is often more interesting than the truth. But in science, facts should be proved by experiments and research, and however great a story is, we should not always believe everything we read or hear.