10. The earth， _____________ we all know， moves around the sun.

9. Do you still remember the day on _____________ he joined the army？

8. This is the room _____________ Lao Liu once lived in.

7. I will never forget the day on _____________ I first saw him.

6. This is the song _____________ we like best.

5. Here is a book _____________ will give a lot of useful knowledge.

4. This is our classroom ,_______ windows或the windows of _______ face the south.

3. This is a story about a girl______ name或the name of _____ is Liu Hulan.

2. The man _____________ you saw yesterday was a doctor from Beijing.

1. We need comrades _____________ can help us.