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Put the sentences into interrogative forms.
1. I have read the book. Have you read the book?
2. She has written the exercise. ......................
3. Mum has made a cake. .......................
4. We have seen a real elephant. .........................
5. They have taken all of the chairs. .........................
6. Mile and I haven't done Maths for today. .....................
7. A happy smile has appeared on his face. .............................