Hello.<br/><br/>Which one is correct?<br/><br/>1. I bought a stamp and envelope.<br/><br/>2. I bought a stamp and an envelope.<br/><br/>3. I saw the man and woman.<br/><br/>4. I was the man and the woman.<br/><br/>Do I need to repeat an article every time I mention another noun?<br/><br/>Thank you.