--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.
A. One B. It C. That D. This
--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.
A. One B. It C. That D. This
A