不好意思，能否讲解详细一些，谢谢了。
12. *The book is interesting ___. Would you like to buy one for your son?
A. to be read B. reading
C. having read D. to read
13.* The __ of the murderer is still a complete mystery.
A. media B. impression
C. identity D. company
15.* The story puzzled me so much that I thought it for a while to ___ it out.
A. keep B. make
C. take D. wipe
23. *Some ____ should be taken to improve the management.
A. slogans B. efforts
C. advertisements D. measures
38. *The poster was revised __ the suggestions of other group members.
A. based on B. to base on
C. basing on D. which base on
48. *This piece of land was designed ___ a garden, but the buildings in it were poor ___ design.
A. in; for B. of; in
C. for; of D. for; in

12. *The book is interesting ___. Would you like to buy one for your son?
A. to be read B. reading
C. having read D. to read
句子的逻辑主语是书,所以不定式后的动作用被动,与主语构成动宾关系.选A
13.* The __ of the murderer is still a complete mystery.
A. media媒体 B. impression 印象
C. identity 身份.D. company 公司;同伴
同意楼上说法,身份.
15.* The story puzzled me so much that I thought it for a while to ___ it out.
A. keep out 把..关在门外B. make out理解;假装
C. take out 把..拿出 D. wipe out 把..消灭
根据句意,把故事领悟.选B
23. *Some ____ should be taken to improve the management.
A. slogans B. efforts
C. advertisements D. measures
固定搭配:take measure to do sth...采取措施
选D
38. *The poster was revised __ the suggestions of other group members.
A. based on B. to base on
C. basing on D. which base on
AD缺少成分,句中也不是用不定式表目的或结果,故B也排除.
选C,现在分词短语做状语.
48. *This piece of land was designed ___ a garden, but the buildings in it were poor ___ design.
A. in; for B. of; in
C. for; of D. for; in
for表目的,先排除AB. 表示设计程度用介词"in".
选D