--Jack's never worked hard at English, _______?-- _______ , so he can't answer the question in English, I think.
David didn’t give up ______ he had failed in the experiment four times.
—Look! That teacher is explaining something to her students again and again! —_______teacher she is!
Lucy liked all the dresses there, but she took the ______one to save as much money as possible for Project Hope.
Mandeep can go to school now. UNICEF has paid for her ______.
—Here are three books on history. Which one would you like to borrow? —______. You see, I’m interested in geography these days.