运用语音知识听读背以下词汇

captain队长

discover发现

investigate调查

partner搭档

deliver分发

through通过

mail slot投信口

keep ...secret保守秘密

听语音完成自默

原形                缩写形式                    

did not= didn't

原形           过去式         过去分词

do        did          done

become      became         become

原形               写出缩写形式            

did not=

写出动词的过去式和过去分词

原形           过去式         过去分词

do        

become      

How do problems

and solutions work

in the story of  

The Mystery of

Purple Footprints?

Can you find soloution for these problems?

Answer: