Is this article ______ you wrote for the magazine?

Some students found _____ hard to study English well .  

.Among all the problems,_______is so difficult as this one.

Have you any knives？ I need a sharp ________.

If our parents do everything for us children, we won’t learn to depend on                     .

It all depends on _______ you can speak Spanish fluently.

I have no idea ________ is better, so I took _______ of them.

Could I speak to ________ is in charge of International Sales, please?

Tom worked hard, but _________ didn’t please the boss.

—Will you take the blue shirt or the yellow one?
—     is the right size for me, I’m afraid.