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~ The maid cleaning the corners.

~ The sun

~ The people on the boat were all coupled

Your questions need a bit of help XD

Somebody was killed in a round house. The suspects are the dad in the study, the mom who was making dinner, and the maid who was cleaning the corners. Who did it?
Answer: The maid

I am so delicate that not even the toughest man can hold me, what am I?
Answer: No clue

What is the only star you cannot see at night?
Answer: The sun

When you unscramble the words "new door" you get one word. What is it?
Answer: No good with scrambles

I am as bight as a diamond, as loud as thunder, yet still never a thing of wonder. What am i?
Answer: Lighting?

A part of a bird that is not in the sky which can swim in the water but does not get wet. What is it?
Answer: Don't know

An item which is light in your hand, that helps things fly, is pretty in your hair, and tickles you. What is it?
Answer: A Feather?

What room has no windows, no floors, no ceiling, and no wall?
Answer: Don't know

What runs around your garden but never moves?
Answer: No clue

I saw a boat full of people but there was not a single person on it. How?
Answer: They are all couples.

What is at the end of a cow, but in front of a woman?
Answer: No idea

When are you allowed to talk to the wall?
Answer: Sorry don't know
Joke response: Anytime as long as you don't mind being called insane.

someone was killed in a round house. the suspect were the dad in the study, the mom makin dinner and the maid cleaning the corners. who did it?
Answer: the maid (corners)

i am so delicate that not even the toughest men can hold me
Answer: A breath

what is the only star you cannot see at night?
Answer: The sun (big ball of burning gases = star)

when you unscramble the word "new door" you get one word. what is it?
Answer: "One word"

bright as a dimond loud as thunder never still a thing of wonder. what am i?
Answer: Damn... um... I'm going to guess a waterfall but i'm not sure because technically they are things of wonder but i'll just go with it because thunder of water dropping.

a part of a bird that is not in the sky which can swim in the water but does not get wet... what is it???
Answer: Okay not too hard with the first part of not in the sky even though the bird is, A shadow

light in your hand helps things fly pretty in your hair and tickles you... what is it?
Answer: Feather

what room has no windows no floor no ceiling and no wall?
Answer: A mushROOM! Another variation i've seen is the object with the thousand windows but no drafts (thimble)

what runs around your garden but never moves?
Answer: I was kind of thinking a stream but if that's not an acceptable answer, then a Wall?

i saw a boat full of people but there was not a single person on it... how?
Answer: It was the Titanic lol, um i think it's lying in the single, it could be that everyone's married and no one's single?

what is at the end of a cow but in front of a woman?
Answer: The letter 'w'