the ages of the students 后面的动词用单数还是用复数?

THE WANING OF THE MIDDLE AGES怎么样 the ages of man 全文翻译 Why the middle ages are known as the dark ages or the age of faith? Comment on why the Middle Ages are also termed the Ages of Faith. THE DARK AGES怎么样 有谁能提供cultural characteristics of the Middle Ages?英文作答 through the ages的意思 QUIDDITCH THROUGH THE AGES怎么样 Down Through the Ages 歌词 翻译：THROUGHOUT THE AGES DIFFERENT IDEAS HAVE BEEN EXPRESSED ABOUT THE WORKING OF THE HUMAN BRAIN. 英语翻译A series of hardness indentations HV5 as specified in DIN 50 133 shall be placed along the centre of the stud,from the stud material through the weld zone into the parent metal. the ages of the students 后面的动词用单数还是用复数? 英语.The ages of the students in our online school_____（range）from 20 to 40. Phelps' swim for the ages.for the 英语翻译The drawn arc welding process uses a special tool (from Germany) that holds the stud and the disposable ceramic ferrule,strikes the arc from the point of the stud,pulls the stud back to form a large weld pool (which is constrained by the He and his friends are of the same _____(age/ages)老师说是复数,为什么> every morning,wecan see people of all ages have() activities everywhere in the city the total ages of two boys is seventeen.what will it be in six years' time?