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Thousands of trees are cut down by them every year.

Penicillin was discovered by Alexander Fleming.

The vase was dropped by him yesterday.

He was elected a member of parliament by them .

Milk is delivered by them every day.

The Mona Lisa was painted by Leonardo da Vinci.

The puppy is fed by the boy every day.

The White Steamship was written by Chyngyz Aitmatov.

The plants are watered by him every other day.