Giúp mình câu này đi ạ

1. Mr. Smith, whom I had come specially to see, was too busy to speak to me

2. I missed the train which I usually catch

3. Most of several houses which I saw were quite unsuitable

4. This is a story of a group of boys whose plane crashed on an uninhabited island

5. He introduced me to his students, most of whom were from abroad

6. He expected to pay me $2 for 12 eggs that four of which were broken

7. She climbed to the top of the Monument to see wonderful view about which she had been told

8. I was given this address by a man whom I met on a train

9. A man who answered the phone said Tom was out

10. At 6.00 when was an hour before the plane was due, thick fog descended

11. I've just spoken to Sally who sends you her love

12. I waited for him until 4.30 at which point I gave up.

[Hoctot]