The rescuing soldiers in the helicopters ______ to land on that earthquakestricken area, but failed again and again.[ ]

________he referred to in his article was often discussed by many people in the past

With April 18’s railway speedup, highway and air transport will have to compete with ______ service for passengers.

Today or tomorrow— What are you talking about— We are talking about _______ to give atalk on WTO.

The Olympic Games _____ in London in 2012. Ihear it _____ in different countries every four years.