Read and judge.读一读，判断，正确的画(√)，不正确的画(×)。   

(     )1.I write a letter on paper.    

(     )2. You can put the stamp in the top, left corner.    

(     )3.I don't need a stamp when I write an e-mail.    

(     )4. You can write a postcard with a pen.