often pointed out, knowledge isa two-edged weapon which can be used ______ for good or evil.

Why do you turn off the light in the room We are in total ______ now and I can’t see anything.

Many kinds of plants and animals are extinct (灭绝). The same thing ________ around the world.

ung man has been trying everything in his powerto please the director, ______ to get a role in the play

Why not come over My family ________ seeing you again.