Ответ:

1. есть
2. He ate his pizza, but he hasn't eat his chips.
3. You tidied your bedroom, but you haven't tidy the living room.
4. They bought some milk , but they haven't buy any bread.
5. She read the newspaper , but she hasn't read the magazine.
6. We was to the bank , but we haven't be to the post office.
7. I wrote to my cousin , but I haven't write to my grandma.
8. He brushed his teeth , but he hasn't brush his hair.