One of the ____ moments in my life was when I conquered my fear and stood on the stage making a speech to hundreds of people.

Have you finished your homework yet—Yes. I _________ it twenty minutes ago.

I want to learn how to play the guitar.–Look, here is _____ advertisement about guitar lesson in the newspaper.

How is your new babysitter? –We _________ ask for a better one. All our kids love her so much.

As we know, England is ______ European country and Singapore is ____ Asian country.