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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 Google, Inc.
→ I want
10. The Nation Air and Space Museum has been renovated. We visited it last year.
→ The Nation Air and Space Museum