Some people who don’t like to talk much are not necessarily shy; they _____ just be quiet people. 

--The room is so dirty.____ we clean it? ---Of course.

Look at the trouble I’m in! if only I ____your advice.

You should have put the milk in the ice box. I expect it  ___undrinkable by now.

When it comes to consumer society, protest groups are insisting that some of our money ______ to the third world.