Ⅰ. 根据句意及首字母提示完成单词(10分)
1. One hundred years is a c_____ .
2. Don’t t _____ rubbish here and there. You must keep the room clean.
3. He’s going to Taiwan for vacation and planning to r _____ there for a week.
4. I like ice cream because it t _____ sweet.
5. It was Madame Curie who d _____ the element radium(镭元素).
