A．A malfunctioning stove.
B．Cigarettes butts left by workers．
C．Violation of traffic rules.
D．Negligence in school maintenance.
A．Sent a story to the local newspaper．
B．Threw a small Thanksgiving party.
C．Baked some cookies as a present.
D．Wrote a personal letter of thanks.
A．It is a trait of a generous character.
B．It is a reflection of serf-esteem．
C．It is an indicator of high intelligence.
D．It is a sign of happiness and confidence.