You ______ be too careful when you drive a car in the rush hour.A．might notB．must notC．can

You cannot be __________ careful 怎么选择

________ when you cross the road.A、Do careB、CareC、Do be carefulD、To be careful

Care must be taken not to wash or iron synthetic fibers at _____.A、a too high temperatu

Teachers can hardly be______careful when they instruct a lesson.A．veryB．enoughC．tooD．so

Be careful when ______ the road.A.crossingB.to crossC.cross

This is a matter which cannot be too carefully watched since failure to comply _____ y