Circle the mistake (A or B) and then correct it, as

Circle the mistake (A or B) and then correct it, as in the example.
1 Do you understand what Ive been trying to tell you all this time?
2 Hurry up! The parade starts in an hour and you are still getting ready.
3 Your fancy dress costume looks fantastic! Is this what are you wearing tonight?
4 Sarah hasnt been to a carnival since she was a little girl.
5 Joshua never takes part in the town parade; he doesnt like wearing costumes.
6 I had been trying to call the festival organisers for the last three hours, but no one is answering the phone.