The water at the bathing beach became______by refuse from the factory.

A.day and night, right through the week
B.two or three times a week
C.at any time of the day, but not at night
D.right through the day, two or three times a week

A．to pay for their children’s education
B．to get to know more writers
C．to set up more bookstores
D．to do what they like to do