What occurs twice in a week, once in a year but never in a day?

There is a family that live in a round house. The two parents go out for a movie and leave a babysitter to watch their son. They come back and the kid was not there. Some one kidnapped him. The maid said she was cleaning in a corner. The cook said he was making pizza. The babysitter said she was getting a board game. Who kidnapped him.

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

I have an eye but still cannot see.

Who am I?

What phrase is represented by the Rebus

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

What 5-letter word typed in all capital letters can be read the same upside down?

What is the next shape from answers A, B, C, and D figure?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

How many times can you subtract the number 5 from 25?