A．Talk less.
B．Change the surroundings.
C．Eat food of good quality.
D．Take plenty of exercise.

A．Because it looks more attractive at night than in the daytime.
B．Because all the buildings there have lights on all night.
C．Because the lights on the major buildings are more colorful than those in any other cities in the world.
D．Because with the brightly-lit buildings and palaces the city is extremely beautiful at night.