1、新目标英语八年级下册第3单元重点知识练习一、选择正确答案填空。1.infrontof inthefrontof(1)Mysisterissitting_______theclassroomtoseethesun.(2)Mysisterissitting_______theclassroomtoreadEnglishwithherclassmates.2.when while as(1)______Iwaswalkingonthestreet,Imetmyoldfriend.(2)Shewassinging______shewaswalking.(3)Iwaswalkingonthestr