Part IIIn the blank, write the past participle of the base verb given in parentheses?

Part II In the blank, write the past participle of the base verb given in parentheses. Example : The repairs on my car had cost (cost) me $600. 9. Shauna has ________________ (ride, ridden) the bus to school all semester. 10. Although the witness had ________ _________ (swear) to tell the truth, he lied. 11. We realized at the airport that we had________ ________ (leave) our apartment door unlocked! 12. Janet has ________ ________ (do) all of her homework for Monday. 13. The tall building was _________________ (shake) by the earthquake. 14. He had ________________________ (mean) to mail the letter on his way to work. 15. Jonas had ______________________ (bet) $200 on the losing team.