问题补充：
Mr Yu gave some new words to Lucy and asked her to on the blackboard.
A. write it down
B. write them down
C. write down it
D. write down them
答案：
A. write it down
(答案→)B. write them down
C. write down it
D. write down them
解析：write down是动词+副词，宾语是代词时，要放在它们中间；且new words是复数，要用复数代词them代替。所以选B.
