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).
