From Mum’s love, patience and understanding, I have learned what a huge responsibility ___ is to raise a child.
nature
The doctor did __________ save the patient’s life.
—Tom, have you finished your homework? —Yes, I ________ before you came back, mom.
I wonder why you didn’t do as ________ and it’s the third time you have done this.
It was so dark outside that the little child ________ go out by himself.