178. There are four basic _____ of blood in the human body. What do you belong to, A, B, AB or O?
The government has to close those small factories to prevent the water of the river ______.
—Will you go swimming with me this weekend? —______.
21.Bob got seriously injured in the traffic accident, but luckily, the doctor came __________to save his life.
He sighed again and the failure in physics seemed to have completely ______ his confidence.
— How is the result, doctor? — Well, your health is ______ good, but you do have a few minor problems.