根据句意及首字母提示完成句子 1. The sun is s_______ all day. 2. He bought a train ticket with a r_______. 3. It is p_______ for him to work out the problem because he is very clever. 4. There are many clouds in the sky, you'd better take an u_______ with you. 5. The wind is too s_______ for the old man to walk. 6. When is the best time to v_______ your country? 7. What will be the w_______ like? 8. It is p_______ to go to the Great Wall.