The boy studied the signs for over an hour, but still could not ______ them, so he turned to his teacher for help.

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 ____.

Suddenly she heard jet engines ____ in distance.

There are still twenty minutes to ____.

They found the conditions there ____.