One of the most important questions they had to consider was _________ of public health.

I remember _____ word he said that day.

They are good friends. _______ is no wonder that they know each other so well.

 I would appreciate _____ , to be frank, if you can take care of my pet dog.

—Have you got any books on English grammar? I’d like to borrow       ． —Yes, here you are．But you must return it by Friday．