. The experiment has_________ the possibility of the existence of any life on that planet, but it does not mean there is no life on other planets.
John opened the door. There _____ he had never seen before.
_______ of danger in the street at night, she had to go home, with a friend ______ her.
At the meeting they discussed three different _______ to the study of radioactive waste.
You shouldn’t have quarreled with the customs official. _______ helping the situation, you just made it worse.
_____, the car stopped all at once.