1.scan:if a machine scans something,it passes an electrical beam over it to form a picture of what is inside it.
My boss wants to this picture.so I scan two pages of picture to him.He says thank you for me.
2.scum:an unpleasant dirty substance that forms on the surface of water.
If you cook milk a long time.You will see the scum on the surface.
3.skit:a short humorous performance or piece of writing.
I buy the magazine in the bookshop.There are a few skits in it.
4.scar:a permanent mark that is left on you skin after you have had a cut or wound.
He has a long scar on his face.I don’t ask him this question.I think he isn’t a bad boy.
5.sketch:a simple,quickly made drawing that does not show much detail.
She is learning drawing.in the workday ,If she is not busy,she will draw a sketch on the notebook.