He is one of the best ... in the world. (science). If a building collapses, it ... falls down. (sudden)

1) He is one of the best_________________ in the world. (science)
2) If a building collapses, it____________falls down. (sudden)
3) The book is very interesting. I lent it to you yesterday.
=> The book__________________________
4) The young women are all from Japan. We met them at the meeting last night.
=> The young women whom______________________
5) Did you thank Mr.Pike? He opened the door for you?
=> Did you____________________________
6) Henry is a journalist. His tape recorder was stolen.
=> Henry__________________________
7) He must be the boy. We saw him running away.
=> He_________________________________
8) John was friendly and intelligent. John found good job.
=> John______________________________________
9) A tsunami killed more than 300,000 people. It hit some Asia countries in 2004.
=> The tsunami which___________________________