Need more riddles plez if better you will git brainles

1. What do teens say when they have trouble with even numbers in their math class?

2. All 5 sisters are busy. Ann is reading a book, Rose is cooking, Katy is playing chess, and Mary is doing the laundry. What is the 5th sister doing?

3. A woman is sitting in her hotel room when there is a knock at the door. She opened the door to see a man whom she had never seen before. He said, “Oh I’m sorry. I have made a mistake. I thought this was my room.” He then went down the corridor and in the elevator. The woman went back into her room and phoned security. What made the woman so suspicious of this man?

4. What occurs once in a minute, twice in a moment, and never in one thousand years?

5. A man lives on the 11th floor of an apartment building. Every morning he takes the elevator all the way down to the bottom and goes to work. In the evening, when he comes back from work, he gets into the elevator, and if there is someone else in it, he goes back to the 11th floor. On rainy days he also goes directly to his floor. On all other days, he goes to the 8th floor and walks up 3 flights of stairs to his apartment. Why?

Explanation:

Hope you like these! I can give you the answers in the comments if you want.

it is c because i got it right on my test