I come in different colors and sizes.

I go to school with you every day.

You put your school books inside me.

What am I?

(a)  

I am in your classroom.

I can help if you make a mistake (错误).

You can use me to erase your work.

What am I?

(a)  

I usually have 4 legs.

I am in your classroom.

You sit on me.

What am I?

(a)  

I am used at school.

I am used for measuring(测量) things.

I am used for drawing straight lines.

What am I？

(a)  

I am used for writing.

I am used for drawing.

You can use a rubber if you make a mistake when using me.

What am I?

(a)  

I usually have 4 legs.

I am in your classroom.

You sit at me to do your school work.

What am I?

(a)  

I come in different colors.

I am used for coloring and drawing.

If the end(末端) gets blunt(钝), you can sharpen me.

What am I?

(a)