新目标八年级下册Unit3每天一练(单元测试) 初二英语第三单元练习 班别 姓名 Unit 3 每天一练(1) Ⅰ.Choose the right answers.单项选择填空。 ( )1.He was sleeping late _______ someone knocked on the door. A.when B.while C.as D.after ( )2._______ the police arrived,the alien left the ground. A.When B.Before C.After D.While ( )3._______ I was walking to school,I saw a cat climbing a tree. A.When B.While C.Before D.After ( )4.You can _______ how strange the UFO was. A.know B.imagine C.think D.imagin