33. He waited until it was dark ____ nobody could see him clearly.
At the end of the game, players traditionally ______ their shirts with each other.
It is generally believed that communication skills are becoming ______ it takes to be a good doctor.
It is our choices that show what we truly are, far ______ our abilities.
The university is saving $ 300,000 per year by its energy ______ efforts.
— A US pilot says he saw a UFO in the shape of triangle, moving very low over bushes two days ago.— ______, but I didn't think that’s true.