11. he gave / was given a present to her. 12. she gave / was given this present for her wedding anniversary. 13. my bike runs / is run very fast. 14. he knocked down / was knocked down by a bike yesterday. 15. her house ruined / was ruined in the fire. 16. i don't know anything about building. i will have built my house / will have my house built. 17. although she is a professional cook, she has all her cakes made / makes all the cakes. 18. she is a hair-dresser, so she has had her new hair-style done / has done her new hair-style. 19. i didn't go to the post office. i had all the letters sent by my secretary / had sent all the letters. 20. our son had his bike repaired / repaired his bike. we are so proud of him.