cen___pets = censed(焚香), censer(香炉), censes(焚香), censor(检察), census(人口调查), cental(公担), center(中心), centra(中心), centre(中心).pets = 宠物sh____t = sherbet(果汁牛奶冻), shallot(青葱), shutout(完全封锁对方).usa = 美国uni____ = unique(独特), unisex(男女皆宜), united(团结), unions(联合会), unison(一致), unites(团结).march = 行军