Our school has a big library. There are about ten books in it.

Are you worried about the coming exam?—No, I think the more ________ you study, ________ mistakes you’ll make.

I like your pet dog very much. But I can’t find _______ in the pet shop. Where did you buy _______?

It may take _________ years to make such robots .

Some girls are on the hill. Where are ____________?