The Bunsen Burner is so named because it is thought ___________ by Robert Bunsen.
No sooner ____ they rushed out into the street.
So carelessly _____ that he almost killed himself.
—— You ought to have given them some advice ---- _____, but who cared what I asked?
—— I cannot see the picture well from here. ---- _____.
____, he never seems able to do the work beautifully.