Helen was so careless that she made _______ mistakes in her math exam.

— Do you have Gone with the Wind?—Yes, but no more than one copy．Would you like to take______?

 The customer didn’t choose ______of the ties and went away without looking at a third one .

Make ______ a habit to put whole-grain biscuits, nuts or raisins in your backpack. 

I knocked on the door several times but _______________ answered, so I left.