The Smiths ________ (have) their breakfast when the morning post came.
were having 在表示姓氏的专有名词词尾加s,前面加the,表示一家人,当这种形式作主语时,谓语动词用复数。根据语境,此处表示正在吃早餐,故填were having。
Peter, together with his parents _________ every Sunday.
A. went hiking B. go hiking C. goes hiking D. hiking