What does below Rebus mean ?

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There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Out of four images which one is the odd one out?

Can you Find and name the hidden bird in the picture below ?

What is the fastest way to double your money?

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

Can you find the hidden animal in the picture below?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?