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21. I, who ____ your friend, will try my best to help you.

A) be B) am C) are D) is

22. I’ll remember the days and nights ______ we were together in Australia.

A) when B) that C) at which D) at when

23. The world ______ is made up of matter.

A) in that we live C) on which we live

B) where we live in D) we live in

24. This is the most difficult book ______.

A) what I have ever read C) which I have ever read

B) I have ever read it D) that I have ever read

25. There comes a time in every man’s life ______.

A) then he has to think C) when he has to think

B) therefore he has to think D) about which he has to think

26. He spoke confidently, _____ impressed me most.

A) so that B) that C) it D) which

27. He took down a square green bottle, _____ he poured into a dish.

A) its content B) which content C) the content of which D) the content of that

28. It wasn’t such a good dinner _____ she had promised us.

A) that B) which C) as D) what

29. All _____ is a continuous supply of the basic necessities of life.

A) what is needed B) for our needs C) the thing needed D) that is needed

30. The goals _____ he had fought all his life no longer seemed important to him.

A) after which B) for which C) with which D) at which