A． They have been accustomed to being obedient to their parents and teachers.
B． They naturally do not need instant gratification before starting to do anything.
C． They know they must sit down and work hard before making any progress.
D． They are repeatedly told by their parents, friends and neighbors to do so.

A． Many people were made homeless by city construction programs.
B． Offshore oil drilling facilities were damaged by a strong earthquake.
C． A severe earthquake raged the island and caused serious casualties.
D． The sea level of the Indian Ocean has climbed to a dangerous height.