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Ответ:

2. This book was written by my favourite author.

3. The cake was decorated with icing.

4. The tiger was shot with a gun.

5. Claire was shouted at by her teacher.

6. He was hit on the head with an umbrella.

Объяснение:

with и by передают Творительный падеж в русском языке (кем/чем).

by - передает Субъект, который совершил действие

with - Объект, с помощью которого было совершено действие