Which is correct to say, ‘The yolk of the egg are white’ or, ‘The yolk of the egg is white’?

The maker doesn’t want it, the buyer doesn’t use it, and the user doesn’t see it. What is it?

Name an eight letter word that has kst in the middle, in the beginning, and at the end.

How would you rearrange the letters in the words NEW DOOR to make one word?
Note: There is only one correct answer.

What would be the next letter in this sequence
O T T F F S S _

What is so unusual about the sentence below?
(Aside from the fact that it doesn’t make a lot of sense.)
“Jackdaws love my big sphinx of quartz”

Enjoy figuring these riddles out. Answers will be published in a week:)
If you have any riddles to share, please post them in the comment section. I heart riddles.