A. all whose homes B. all of whose homes

　　C. all their homes D. all of their homes

　　22. The humans are destroying nature day by day, ________ of course, will cause severe punishment from it sooner or later.

　　A. who B. when C. on which D. which

　　23. Is this research center ________ you visited the modern equipment last year?

　　A. where B. that C. the one that D. the one where

　　24. Some pictures of the river brought the days back to the old ________ they swam in it.

　　A. when B. that C. who D. where

　　25. The man showed us so heavy a stone ________ no man can lift.

　　A. that B. as C. which D. and

　　26. He stayed there for quite a long time, during ________ time he learned much spoken English.

　　A. that B. this C. which D. Same

　　27.The place _______interested me most was the Children's Palace.

　　A. Which B. where C. what D. in which

　　28.Do you know the man _______?

　　A. whom I spoke B. to who spoke C. I spoke to D. that I spoke

　　29.This is the hotel _______last month.

　　A. which they stayed B. at that they stayed

　　C. where they stayed at D. where they stayed

　　30.Do you know the year ______the Chinese Communist Party was founded?

　　A. which B. that C. when D. on which