请问下面单词的同类词有哪些
1.pencil ruler eraser 2.play jump walk 3.his ours theirs
4.train taxi ship 5.tiger leopard cat 6.high tall new
7.themselves myself himself 8.twenty-one thirty-two forty-three
9.worried tired sad 10.once usually every day 11.hot dog burger corn 12.what where which 13.potato carrots mushoms 14.angry scared bored 15.kitchen bathroom living-room 16.Americe 17.boring interesting funny 18.trousers shorts sooks
19.buy cost pre fer 20.stomach knee chest
(要求:每个至少再写三个、单词都是小学水平、越多越好、若既多又好假300悬赏分）
第16个是Americe England Italy