1. A. Has B. Was C. Had D. Is 2. A. Known B. Recognized C. Written D. Called 3. A. on B. In C. By D. For 4. A. Whose B. Who C. These D. Which 5. A. Wanted B. Made C. Started D. Missed 6. A. Until B. Whether C. While D. Though 7. A. Some B . The C. An D. That 8. One B. He C. They D. It 9. A. Than B. Therefore C. When D. Then 10. A. To B. As C. For D. So