---How often does he go to the Swimming Club? ---________.
The safety of food has become one of the _________ problems in our daily life.
We must _______ what he is doing now and then we can take action.
—Do you know that old woman? — Yes, she is Mrs. Green. And she ____ leaves her house because she can’t walk far.
In the school talent show, Linda performed well and Ann did even.
— Are you free this Sunday? — Yes, I am. I have ________ to do.