Question

how does toto come to grandfather's private zoo

Answer 1

Grandfather bought Toto from a Tonga driver. The Tonga driver used to keep the monkey tied to a feeding trough. The monkey looked out of place there. Grandfather bought it for 5rupees. He decided to keep it in his private zoo.
Hope this helps you friend
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Answer 2

Toto came to grandfather zoo. Grandfather bought the Toto in five rupees from the Tonga driver who feeding him at feeding trough