1. Victor painted the house.     
The house......  by Victor.
2. Alex read the graduation speech.   
The graduation speech.....  by Alex.
3. The queen bought white diamonds.   
White diamonds.........  by the queen.
4. The students helped the senior citizens.   
The senior citizens.........  by the students.
5. Rich women often wear silk dresses.   
Silk dresses  often........  by rich women.