Complete the sentences with the correct form of these words. parents/letter/exit/ warn/signature/noticeMy parents came

1. Write your signature at the end of the form.
2. Her mother wrote a thank-you letter to her friend. 
3. The teacher warned his pupils to be quiet in the exam.
4. The exam results are on the notice board.
5. Charlie wanted to leave the shopping centre but he couldn\'t find the exit.