when:you should be careful when _____ the street in big cities.选项是:a.to cross b.cross c.crossing d.crossed这个题目为什么选c呢?

You should be careful when you cross the m____ road . you should be polite when you (meet)your teacher tomorrow You should be more _______ (care)when you are driving. you ---be too careful when you are driving.A should B needn't C cannot D must You should be careful when ______(cut) the cabbages. when you are writing,you have to make sure that the words ( ) correctly.A.are spelt B.were spelt C.will be spelt D.should be spelt为什么, when you leave the room,make sure the door _____.A.was locked B.is locked C.will be locked D.should be lucked you should be great You should be mine When you leave he room,make sure the door_____.When you leave he room,make sure the door_____.A.was locked B.is locked C.will be locked D.should be locked 选哪个?并请说明原因,TKS! you should be careful when you( )the street；A.across；B.go across选那个?为什么? You should be 什么 when you are in the reading room. 同义句转换 You should be polite when you talk to others. When you listen to the teacher you should be careful同义句是什么 When you listen to the teacher you should be careful同义句是什么 英语翻译you should be with a guy who knows what he has when he has you. put the book ____ it should be when you have finished reading it.A where B at the place C in which 如何理解此句意You are saying that everyone should be equal ,and this is_____Idisagree.A.when B.where C.what D.how为什么选B