1.The old man is the only one _________________________(事故的目

1.The old man is the only one _________________________(事故的目击者）
2.书籍被一本一本地摞在一起.Books are piled _____ _____ _____one another.
3.昨天李明和我交换了座位.Li Ming ____ _____ ____ ____me yeaterday.
4.同义句转换.
After everyone got to the class,the teacher started teaching.
The teacher ____ _____teaching _____everyone got to the class.
5.用英语写出警告语.
（1）一个三角形里面一个感叹号；
（2）一个圆里面一只向下伸的手,手下面有一"____",整个图案有一个""