8. Complete the sentences. Use present perfect.

1. Mrs. Johnson has become a writer. 2. Bob and Charles have been to the States many times. 3. Have you swum in the Pacific? 4. We have not done our lessons. 5. I have not decorated the hall. 6. The girls have jumped high. Their results are excellent. 7. Betty has begun learning English. 8. Polly has rung up Doctor Gordon. 9. Boris has not come back. 10. Jane says she has not seen any of the Harry Potter films before.