The rescuing soldiers in the helicopters ______ to land on that area, but failed again.
Many friends sent me e-mail to ________ me on the birth of my son.
Many people ________ the accident, so it was not difficult to investigate(调查).
It was along the Mississippi River _________ Mark Twain spent much of his childhood.
In 1938, Hitler _________ war against Poland, which started the Second World War.
A serious earthquake struck the village, __________ many people homeless.