What does this rebus riddle means ?

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

I know a nine-letter word having only one vowel.
Do you ?

What number do you get when you multiply all of the numbers on a telephone's number pad?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside.
The man said, "Oh! I am really sorry, I thought this was my room."
He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man.
What made her suspicious of that man? He might have been genuinely mistaken.

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

Find the missing number in the image below.

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?