Be careful when you go across the bridge.说明一下为什么要用careful和across这是个新课堂的题 现在速求

Be careful when you c_______ the street be careful when you corss the m___road Be careful when you walk意思 Be careful when you ____the hill You should be careful when you cross the m____ road . 填空题 When you walk___the road,you must be careful. you must be careful when you （ ）the street be careful when you go --------(cross) the road Paul,______（be） careful when you cross the road. Please be careful when you go____the road.(cross) Please be careful when you go a( ) the road Be careful when you walk ____ the streetthroughacrossintofrom You must be careful when crossing the street.改为祈使句 翻译 Be careful when you come to the traffic light. 连词成句：cross,be,the,when,careful,you,street Be careful when you walk cross the road改错 Be careful when ( you are ) crossing the street. You should be careful when ______(cut) the cabbages.