What is the preposition in the sentence "The book is on the table."?

In the phrase "The cat is under the chair.", what word is the preposition?

Which word is a preposition in the sentence "The keys are beside the door."?

What is the preposition in the sentence "The ball rolled into the basket."?

In the sentence "The dog is behind the fence.", what word is the preposition?

Which word is a preposition in the sentence "The pen is on top of the notebook."?

What is the preposition in the sentence "The chair is next to the table."?

In the sentence "The hat is beneath the coat.", what word is the preposition?

Which word is a preposition in the sentence "The ball is inside the box."?

What is the preposition in the sentence "The cat is on the mat."?