Answer:
1. THE VEGETABLE IS AVAILABLE AT A VENDOR STALL.
2. THE APPOINMENT CANCELLED BY HARRY
3. THE LETTER HE WAS WRITTING WAS FOR HIS DAD.
4. THE LESSONS LEARNED BY HER
5. THE KITCHEN CLEANED BY THEM.
Explanation: ALL OF THEM ARE EXAMPLE OF PASSIVE VOICE BEACUSE PASSIVE VOICE IS A subject is a recipient of a verb's action. MARK ME AS A BRAINLIEST FOR MORE QUESTIONS