A．Because she had them put in only a few months ago.
B．Because she wanted to save the new ones for future use.
C．Because she liked worn-out plugs.
D．Because she got them well cleaned.

A．They didn’t know how much each person owed for telephone calls.
B．They couldn’t understand each other since they speak different languages.
C．They had difficulty deciding who should cook.
D．They had different lifestyles.