我知道,我都上到剑桥英语3级了,Jack is twice as old as Bill,who is jack dhufp 'at. ofzeji the tnaesct.eight years younger than Ben,who is four years younger than Ted,who neijc meipot yueioo,too you the hotwtr yenag mics zhan ,opul supy.is half as old again as Jack.How old is Bill? she/he the fotou mi.