28. I’ll tell you all what he told me last week.

27.Is oxygen the only gas which helps fire burn?

26.---How do you like the book?

　---It’s quite different from the one what I read last month.

25.I, who is your good friend, will try my best to help you.

24.Did you see the man whom I nodded just now ?

23.All the apples which fell down were eaten by the pigs.

22.They have decided to stay at home, that is , I think ,a wise choice.

21.She was the one I met at the party , whom you knew.

20.It was a meeting that importance I didn’t realize at that time

19.The reason why I was away from school is because I was ill yesterday.