Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

Do You See It?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

The more of this there is, the less you see. What is it?

Before Mount Everest was discovered, what was the highest mountain in the world?

I have no life, but I can die. What am I?

Cristina leaves home and then she makes exactly 3 left turns and returns home where she found 2 girls wearing the mask.

Who are these two masked girls?

Which is the correct shadow of the bird?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?