It’s ______ here; we can’t work long hours here.

 Once he makes up his mind to do something, he will devote himself _________to it.

We haven’t heard from her for long, so we give her_____for dead.

—Why are you so late?—The driver couldn’t see clearly because of the fog．____, the road was too icy．

The most frightening words in English languages, as it is, are "Out computer is ______________."