期末考~急be careful not to get off the bus until it stops.为什么until不能改成before

期末考~急be careful not to get off the bus until it stops.为什么until不能改成before don't be careful和be not careful的区别 Please be careful .Do not make the same ____ next time.急 求求了 期末考~急we shall be careful (not bite) by the dog be careful ------（not hurt）yourself 期末考~急may be you can't stand it.是啥意思 be careful的同义词组是什么急 bei careful not to fall ill这句话是对么be careful not to fall ill 期末考~急regarded time as important. 期末考~急on either of your be careful be careful! be careful be careful 求教!Be careful not to fall ill． Be careful not------illA beingB beC to fallD fall Be careful not to c____your hand!The knife is dangerous