Boys and girls,o___your books and turn to page 6

Boys and girls,o___your books and turn to page 6 Open your books and turn to ___(page) 21. 排序,组句子：1.open,books,yuor,turn,page,5,and,to.2：bob,look,have, American boys and girls love to watch Hello,Boys and girls,w_____ to china. put (at/on) your books,boys and girls! Now open your books, boys and girls.是什么意思? Hello,boys and girls! Boys and Girls 歌词 boys and girls. Hello,boys and girls Open your books and turn to page 20.为什么这里的book要加s?什么情况下要加s?动