Unit 5 Signs同步练习一、根据汉语，完成句子。1. _______________(当心), Tim.2. They are _______________ (在购物中心) .3. Sam and Bobby are_______________. (去远足)4. Helen and Mike_______________ (进入) a bookshop and bought some books yesterday.5. That sign means _______________. (请勿乱扔垃圾)二、选...
