China is a country ____the Third World, _____ means her economy still needs developing very much.

_ properly, a car can be used for many years.

The 2012 Olympic Games ________ in London appealed to a lot of people across the world.

  .He was deep in thought with his eyes______ on the ceiling.

 ________ at the foot of the mountain is an old church _______ back to the 18th century when it was occupied by the French.