Помогите пожалуйста!!! Pick up sentences with the verbs in Passive voice

Помогите пожалуйста!!! Pick up sentences with the verbs in Passive voice from the next London Zoo;
London zoo is a place of interest for many visitors. It was opened in 1827 by the Zoological Society.Today there are more than 8000 animals in the zoo.Some are very rare, so they are kept for the purpose of producing young. They are studied and protected by zoo specialists from getting any harm. Many animals were born in London Zoo or in other zoos around the world. All animals have good habitats here. Scientists and zoo keepers teach then about wild life conditions.
The elephants have the biggest appetite in the zoo. An elephant's diet consist of hay, grass, linseed cakes, cabbages, carrots, potatoes, dates, salt, vitamins and minerals, washed down with 100 liters of water.Every day you can watch animals being fed, for instance snakes, lions and seal.