Find and correct the mistake in each sentence

Find and correct the mistake in each  sentence                                                                                     1. How old are  you ? I’m seven year old .                                                                                          2. There are a little doll on the bed .                                                                                                 3How many dolls does your sister have ? She has three doll.                                                    4 There are two posters in the wall .                                                                               5. What dose peter   have  a blue ball .                                                                            6.What is your favorite toy is a puzzle.                                                              7.There  is an teddy bear in the box.                                                                                                             8. Dose he have a puzzle? Yes, she does.