4. I have never met the man. He gave me a lift this morning.
» The man
5. Scientists are working with stem cells. Stem cells will revolutionize medicine..
→ Scientists
6. Most of the books are still popular today. I read them as a child.
- Most of the books
7. We won't forget the day. We went to Justin Bieber's concert that day.
→ We
8. The book is about Gagarin's flight to the space. Mr. Henry gave it to me.
→ The book
9. I want to introduce you to Mrs. Black. Her husband is a software engineer at Goo
→ I want
10. The Nation Air and Space Museum has been renovated. We visited it last year
→ The Nation Air and Space Museum