What English word has three consecutive double letters?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

A spy was in Canada trying to steal insider information on how to set up new Maple Syrup factories in their country. He was introduced to the operations manager of the biggest factory in Canada. However, the manager was suspicious and decided to test him with a question before he trusted him. So he asked, “What would you be sure to find in the middle of Toronto?” The spy thought fast and came up with an answer for the manager. What was his answer?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?

what does the below rebus means?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?