An early typewriter produced letters quickly and neatly; the typist, _____ couldn't see his work on his machine.

Everyone should keep on getting himself educated so as to be______modern technology.

Noone has _____ been able to trace the author of the poem.

Everyone who reached the top of Mount Tai was       with a magnificent view.

I’m very pleased with the results of my blood test, for all tested items show _____ reactions.