20. Li Ying is not the girl _____________ she used to be ten years ago.

19. There are stars _____________ we still don’t know in space.

18. They talked of the things and persons _________ they remembered in the school.

17. Everything _____________ I told you just now is true.

16. Here are five fish. The two _____________were caught yesterday are gold fish.

15. We have found such materials _____________ are used in their factory.

14. We used the same type of machine _____________ they did.

13. He did not study hard， _____________ led to his failure.

12. The sun is bigger than the earth， _____________ is known to us all.

11. _____________ is known to all， the earth is round.