21. Many lifestyle patterns do such ___great harm to health that they actually speed up ___weakening of the human body. A. a; \ B. \; the C. a; \ D. \; \
22. Peter’s jacket looked just the same as Jack’s, but it cost his.
A. as much twice as B. twice as much as C. much as twice as D. as twice much as
23. ____ work has been done to improve the people’s living standard.
A. Many B. A great many C. A large number of D. A great deal of
