whose dictionaries are these?they are the

these are dictionaries提问dictionaries Whose _____(Walkman)are these?Are they the ______(twin)? 英语Whose autivity books ( are ) these?They are the (students‘ These are dictionaries.对dictionaries提问 whose pens are these?____(these/they) are mine whose books are these?They're t______ Whose are these new rackets?They are __________(there). Whose teachers are these They are ours改成单数形式 帮帮忙吧whose books are these?They are not_,but_. whose keys are these?they are y什么 keys. 单项选择：Whose book are these?They are （ ）. whose sunglass are these?