Question

One day farmer donkey fell into a well by ------------------ (accident /accidentally )

Answer 1

accidentally...
hope it will help you

Answer 2

Answer :

Cambridge English Dictionary defines 'accident' as 'something bad that happens that is not intended and that causes injury or damage.'

Cambridge English Dictionary defines 'accidentally' as 'by chance or by mistake.'

From the above definitions, we can see that the word 'accident' fits in the context of the sentence.

So, the correct sentence is :

One day the farmer's donkey fell into a well by accident.