Part C
You will hear a talk. As you listen, you must answer or complete the sentences for questions 21—30 by writing NO MORE THAN THREE words in the space provided on the right. You will hear the program TWICE. You now have 60 seconds to read questions 21—30.
What duty has her granny fulfilled through years of toil

A．Many burglars break into residential houses without using force because the doors are not locked.
B．Residents should fit in break-resident glass for the sake of safety.
C．Some burglars can break into a house even the glass is break-resident.
D．People should make very sure that each door is locked when they go out even for a very short period of time.