解释文中加点词语的意思。
①以:______________ ②书:______________ ③竟:______________
④至:______________ ⑤彀:______________ ⑥老:______________
⑦幼:______________ ⑧体:______________ ⑨当:______________
⑩乐______________ ⑪福利:______________ ⑫其:______________
⑬与使:______________ ⑭谓:______________ ⑮是:______________
⑯相:______________