问题
填空题
请读句子，将小老鼠所居住的楼层号写在横线上。
1. 
I live on the fifth floor. ________________
2. 
I live on the twelfth floor. ________________
3. 
I live on the ninth floor. ________________
4. 
I live on the twentieth floor. ________________
5. 
I live on the second floor. ________________
答案
1. 5 2. 12 3. 9 4. 20 5. 2