Ответ:
1. Kate has given a book, which I bought for her
2. Beautiful flowers are being picked up at this moment
3. My favorite cake was baking when he came to our place
4. All the sandwiches was eaten and then they drank all the lemonade. They left nothing
5 This building is used only on special occasion
6. I did not introduced to her mother
7. Black shoes has not been worn today. They mended
8. These old things are not used for ages
9. The match will be postponed tomorrow, because of the weather
10. He was a brilliant speaker