It may be necessary to stop______in the learning process and go back to the difficult points in the lessons.

Is she __________China——Yes, She is ________.

It’s said that a number of children in those countries don’t have enough food.—________. I think people all over the world should help them.

Did you go to Jack’s birthday party —No, I _______.

Though the blacks in the United states have been fighting for equal rights ____ the whites for many years, they _____ won the battle[ ]