______ is even more important is that the earth cooled down, water began to appear on its surface.

_____time goes by, my grandfather’s memory seems to get worse and worse.

— You should have prepared your speech for the meeting, Mr. Smith. — Yes, I know. But how could I _____ the meeting date fixed so soon?

Most of the Europeans refuse to accept GM food________Americans regard it as the fruit from high tech.

 It is by no means clear ________ the president can do something to end the strike.