1. Who is doing  research in the library is our teacher

2. who is very intelligent is talking to our form teacher

3. went to the play last night and enjoyed the play very much

4. who we met last summer takes part in the charity activities.

5. he tried hard, but he could not finish his homework in time

6 the dog which bit a boy yesterday.

7. is absent from school because her mother is in the hospital

8. in the factory where there are more than 1000 workers.

9. the sky was cloudy, we took a lot of pictures

10. she had a poor memory, she still told interesting stories to her son