【题目】You can take anything from the shelf and read, but please the books when you’ve finished with them.
A.put on
B.put down
C.put back
D.put off

【答案】C
【解析】A. put on穿上，戴上；B. put down写下；镇压；C. put back把……放回原处； D. put off推迟，延迟；句意：你能拿书架上的任何东西去看，但是看完后请一定把书放回原处。
根据句意，故选C。