Their success was due ______ to their well-conceived plan.

The little kid finally ____ that he took the bag away.

Sometimes people carry ____ luggage on the airplane.

If the Black Box is orange, ____ do people call it Black Box?

Mr.Smith is one of the ___ of directors.

The ____ of the reginal airline increased by 3% per year for three years in a row.

Dangerous goods need special ____.

____ that flight engineer ____ the checking procedures?

We were sure the pilots of the plane kept away from the mountain tops ____ radar.

Do you think smoking ____ health?

The work was found all ____.