Tom pretended ______ it;but in fact,he knew it very well.
The waste water, when _______,should be clean enough to meet standards.
As for me, few excitements can beat ______of being admitted to my favorite university.
--What a beautiful dress Jane is wearing! --But it doesn't look good ____ her skin.
Under no circumstances _______the search far the missing plane.
Tired of switching from one company to another, he finally found a____ job in the government.