Before ______,the play must be examined by the director.A.putting on B.to be put on C.put on D.beingput on 就可以表示被动，为何不选put on

I ______(not see) the film before. she said she ______(see)the film the day before water the pl〔 〕. Please take the medicine before supper.(改为否定句)Please _____ ______ the medicine before supper We _____(paint) the house before we ______ (move) in. Remember ______(shut) all the windows before you leave My father came back the day before yesterday.My father has ______ ______ for two days. All the students should go over the lessons before exams.（改为一般疑______ all the students ______ over the lessons before exams? Mr Robert had seen the film before.(改为反意疑问句） Mr Robert had seen the film before,______? The doctors kept on saving the old man ______ he woke up.填before行不行?till,until,before何时转换？ 改为一般疑问句：They can speak Chinese very well.______ they ______ Chinese ______ ______.改为一般疑问句：They can speak Chinese very well.______ they ______ Chinese ______ ______.She is good at playing the piano._____ ____ good at pl Tom was ill the day before yesterday.(对划线部分提问)划线部分是illWhat was ______ ______ Tom the day before yesterday she ran to the station only ______(find)that the train had left 2minutes before i remembered ______ the door before i left the houseA:lockingB:lockC:to lockD:locked We didn't know the new teacher,so he ______ himself before the class began. The students must have finished his homework the day before yesterday,______ he? it's （n ______ ）to look over the text before doing the homework. ______(turn) off the light before leave the classroon.空里填什么,解释