譯文如下：
1. As a historical and cultural city, Shanghai for its unique charm attracts millions of tourists from home and abroad. (one)
2. Only continuously research unknown things, can we have a new discoveries and inventions. (has)
3. If the child get timely treatment, he is likely to restore health within a week. (chance)
4. As long as you have a clear aim, and work hard, you will succeed. (as it as)
5. After graduating from secondary school, most of them will enter a different university to study. (will)
6. If you need my help, please don't hesitate to call me, (hesitate)
希望有幫助到您,乜希望您可以采納我的答案.