1. Who was Australia discovered ? 2. The play was written Shakespeare. 3. This cake is made butter and sugar.

Resolution:

1. Australia was discovered by Captain James Cook.

2. The play was written by William Shakespeare.

3. This cake is made with butter and sugar.

Explanation:

The preposition 'by' is used to indicate the agent or creator of an action. For example, 'The book was written by Jane Austen.' It is also used to indicate the discoverer of a place.

The preposition 'with' is used to indicate the ingredients or materials used to make something. For example, 'The salad is made with fresh vegetables.' or 'The house is built with bricks.'

Answer:

1. by
2. by
3. with