--- There must be a dozen pens in this house but I can never find one when I need one. --- Keep looking. _____ is sure to turn up.
—Come in, please.Make yourself at home. —I'm glad you like it.
What a pity! He____________ the only chance of success.
—Which one can I take? —-You can take__________ of them; I'll keep none.
Mr.Smith sold that magnificent cottage of his on the sea 2,000,000 dollars.
___________lessons were not difficult.