Ⅰ. 根据句意及首字母或汉语提示完成单词（10分）
1. It’s good for us to brush our _______ (牙齿).
2. Look! Your room is in a m _______ (杂乱).
3. China is _______ (发展) very fast.
4. Look! A car is moving t________ us.
5. Watch your s _______! There are some flowers in front of you.
