单元基础知识过关
19.软的;柔软的(adj.) ________ 20.安静的;平静的(adj.)________ 21.努力;艰难 (adv.& adj.) _______ 22.一起(adv.) __________ 23.在……的里面;在里面(prep.& adv.) _______ 24.在……之上(prep.)_______ 25.三十(num.)_________
soft
quiet
hard
together
inside
above
thirty