A．They learn to do them by being corrected all the time.
B．They learn to do them by being taught by skilled people.
C．They learn to do them through comparison and discovery.
D．They learn to do them with the help of other children.

A．Because they can’t find a suitable unfurnished house.
B．Because they have to wait till they find a house with furniture.
C．Because they haven’t saved enough money to buy furniture.
D．Because they are thinking about buying a house in the suburbs.