Проверьте пожалуйста дз по англ по пассивному залогу)

Я пытаюсь разобраться в пассивном залоге, вот что выходит:
1. Calvin Klein has designed this dress - This dress has been designed by Calvin Klein
2. They are building a new bridge - a new bridge is being built
3. My mother will knit a pink sweater for me - a pink sweater will be knitted for me by my mother.
4. Karen sent James an invitation - An invitation is sent to James by Karen.
5. Where did they park the car - Where WAS the car parked ?
6. Who wrote the music for Cats - Who was the music for Cats written by?
7. They were painting my flat when i arrived - my flat WAS being paintED when I arrived .
8. They had cooked the meal before the lights went off - the meal haD been cooked before the lights went off
9. Puccini composed many famous operas - many famous operas WERE composed by Puccini
10. They decorated the cake with flowers and chocolate pearls - the cake was decorated with flowers and chocolate pearls.

3. My mother will knit a pink sweater for me - A pink sweater will be knitted for me
by my mother.
4. Karen sent James an invitation - An invitation was sent by Karen to James
5. Where did they park the car - Where was the car parked?
6. Who wrote the music for Cats - Whom was the music for Cats written by?
7. They were painting my flat when i arrived - My flat was being painted when i arrived
8. They had cooked the meal before the lights went off - The meal had been cooked before the lights went off
9. Puccini composed many famous operas - Many famous operas were composed by Puccini
10. They decorated the cake with flowers and chocolate pearls - The cake was decorated with flowers and chocolate pearls