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1. She does sports four times a week. 2. Whose friends came late? Our friends. 3. They discuss a very important issue at the blackboard. 4. Don't scream! I can hear what you are saying. 5. They finished reading the book yesterday. 6. Mary cannot walk. She broke her leg. 7. He told me his name, but I forgot. 8. Has it stopped raining yet? 9. They won the battle. 10. I wrote a letter, but I have not sent it yet. 11. Tomorrow will be Saturday. 12. Caution! You will break this cup. 13. What time does the concert start? 14. What are you doing this weekend? I 15. He's about to come.