Parents now believe that there are obvious differences in their approach to educating children compared with _____ of their parents.   

(2013·新课标全国卷Ⅱ)It's an either­or situation —we can buy a new car this year or we can go on holiday but we can't do ________.

 The Smiths have three daughters, one a baby, and ________ twins of twelve. 

His father insisted on punishing him, but he insisted he had _______ to do with the matter. 

——　Have you ever seen a whale alive? ——　Yes, I’ve seen ＿＿＿.