—Sorry, Liz. I think I was a bit rude to you.—______, but don’t do that again!
His promise ______ he would give away half of the year's income to the disabled turned out a lie, ______ made the public feel cheated.
______ the rising house prices will be under control is what worries people most.
No one really knows exactly when the first group of people arrived in ______ we now know as California.
Some experts think the wolfs team spirit for survival is ______ is needed in today's competitive culture.
Many experts believe that teachers' development is ______ the key to better education lies.