She didn’t refer to the matter in the meeting

She didn’t refer to the matter in the meeting. NO
She made .................................................................. to the matter in the meeting.
16. The Curies are famous for discovering radium. THEIR
The Curies are famous .................................................................. of radium.
17. The twins are not at all similar. ANY
There isn’t .................................................................. between the twins.
18. Earthquakes have become more frequent recently. INCREASED
The .................................................................. recently.
19. I’m not sure whether the new system is efficient. OF
I’m not sure about .................................................................. the new system.
20. They were still discussing the project when I asked him. UNDER
The project was still .................................................................. when I asked him.