Then moment _________ Mary will always remember is _________ Mr.Black gave her a lot of valuable advice on how to improve her writing.
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.