If it ________ for the heavy rain then, we would have arrived here ahead of time.
You don’t have to know the name of the author to find a book. You______find the book by the title.
Many workers were organized to clear away ________ remained of the World Trade Center.
Some of the scientists held the point________ the book said was right.
Was it ________ the conference of APEC that made Shanghai the focus of the world then?
Use your head. nothing taught by others can have the same effect on you as ________learned by yourself.