John has put forward _______ most challenging question for us to answer.-Yes, it really is. I have never heard _______ harder one.

People were not allowed to enterthe reading room because it _______

I’m going to do for your party.— Sounds great!.

My grandmother has kept the photo ______ she can see it every day for a couple of decades.

No matter how low you consider yourself, there is always someone _____you wishing they were that high.[ ]