It's helpful to put children in a situation ________ they can see themselves differently.
In the past ten years, great changes _______ in my hometown.
The third and last chapter _______ by Professor Chen.
-- No, I’m afraid he isn’t in. This is his secretary speaking. Can I help you? --- _______.
______ the plane have taken off on time? --- I’m afraid not. The fog was too thick then.
There have been many changes in _____ history of _____ English language.