—Tom, it seems that you haven’t cleaned your bedroom the whole week .—You didn’t come in around 10 yesterday morning; I ________ it .
________ him before, I didn't recognize him.
As a teacher, I seldom give my students so difficult a problem ________ they can not work out.
None of us had expected the middle-aged engineer died ____ his design uncompleted.
______, Obama’s health care reform hasn’t been accepted by all the Americans yet.
Many of the creatures in the movie “Avatar” are not real, but much of __________ happens is attractive.