Some students （ ）fail in the test because they don’t work hard at school.A：can’t B：can C：mustn’t Dmight请说明一下理由,顺便问一下,这里的fail是什么词性?

some （ ）students (china) sin(wx+fai）为偶函数,怎么求fai some students go to school on the boat.(改同义句） some students ()()()to school. Some students are in the room.(对划线部分提问）划线部分是Some students some students were late some students were late wifi读“外fai（第一声）”还是读歪fai（第四声）. 三角函数y=Asin（wx+fai） 带入最高点求fai,请问三角函数符号怎么去掉 Show some nice pictures to the students（同义句） There are some students in the ciassroom ,（ ）（ (反义疑问句) Some students may run downstairs.（对run downstairs提问） 第一句话该怎么改（some students）求讲解 Some students are planning a City ____(清洁）Day （ ）some students,the teacher entered the hall. Many students can do some work for the show（改成被动语态）Some work ( )( )( )( ) many students for the show Some students can't decide which dicitionary they should choose.（改为简单句）Some students can't decide______dicitionary _______choose Some students swimming in the sea,some students played beach volleyball.这句话对吗（注意：这是过去式） some students与many students一样吗?