21. Why do we pay so much attention to gossips about pop stars, _______ millions are made up and forgotten every day?

A. where            B. when               C. what             D. which

22. At ________ he thinks is the appropriate moment, he will tell them all ________ he has suffered these years.

A. when; that        B. when; what         C. what; what         D. what; which

23. The white building, _______ threats to pull it down, is now a private house in the possession of a retired professor.

A. survived       B. surviving           C.to survive           D. having survived