A：These pens are Paul's,aren't they? B：yes, they are.
A：These are my sandwiches,aren't they?B：yes, they are.
A：These papers belongs to Mr.and Mrs.Jenkins,don't they?B：yes, they do.
填空解释：由于这三个句子都属于反义疑问句,一般情况下be（am , is, are）动词的话,就还用be（am, is, are）动词回答,如果是其他动词的话,就用do或者does等.