Be careful _____ the street.A.crossing B.cross C.across D.to

Be careful _____ the street.A.crossing B.cross C.across D.to Be careful when you_____the road.A.cross B.crossing C.crosse 第一题：You must be careful before you( ) A.across B.crossing C. Be careful when you cross the street.为什么用cross而不用across? ___ careful when you cross the road. A. Do B. Do be C. Is D. Be careful!It is d( ) to run across the street now be careful to look both ways before------(cross)the street Mary is swimming ___ the river.A、to cross B、crossing C、cross Be careful to look _____ways before you cross the street. A. you should be careful when you( )the street；A.across；B.go ac Be careful while crossing the street.Don’t forget ___ over b Be careful when you are crossing the street.