Mrs. Black doesn’t believe that her son is able to design a digital camera, ______?
Canada,Australia and New Zealand are all ____ countries.
He ____ me to keep away from cigarette and take more exercise.
I _____ to take a holiday this summer, but I had to change my plan .
-I heard Back Street would sing at the New Theater. -Where did you _____?
-Are you satisfied with her answer? -Not at all. It couldn’t have been _____.