It is necessary to remove _____ from the cooling spaces.A.scarB.scaleC.spurD.bilge

It is necessary for the ship to contact ____ for authorization prior to undertaking mitiga

It is necessary that something urgent______ to combat smuggling.A．is doneB．be doneC．has to

It is necessary that a person______exercises everyday if he wishes to be healthy.A．doB．doe

The life boat______in case it is necessary to take off the crew of the damaged ship.A．has

In your job hunting it is necessary to________.A.

.It is necessary to make clear to the boss______.