第19题: Before 14:00.|Before 15:00.|Before 16:00.|Before 18:00.

It can not be used before ( ). Must I finish my homework before I go home—-No, you _____. But you ____finish it before tomorrow. 第f19题 Have you _________ the story before? Before you begin writing The lecture began before we _____. Before you go on stage All but John （） that film before、 Before you enter the museum,______. Before Facebook appeared，people（）. When the spaceship traveled above，______new looking earth appeared before us，______earth that we had never seen before. 《天堂的海龟》第17章第19题（） Remember to confirm how to charge before enjoying these entertainment facilities, otherwise it may cause unnecessary trouble before you go to the bar. Must I be home before eight o’clock, Mum—— No, you . But you have to come back before ten o’clock. Remember to confirm how to charge before enjoying these entertainment facilities, otherwise it may cause unnecessary trouble before you go to the bar. When can David get slides to his supervisor？: A week before he goes.|Three days before he goes. The magician is planning to hide the Oriental Pearl Tower before a big audience.—Really I have never heard ____________ idea before. Before the police , the alien left the shop . The magazine ________ where he ________ it before. Has John heard of Rose before?