Once______ a difficult and even dangerous place______,Vietnam is now a friendly destination that welcomes visitors from all over the world.
At that time, he spent as much time as he can_____the ancient statues which would be sunk in the river.
Mr. White, along with his assistants, ______ on the project day and night to meet the deadline.
As we have known from the map of the world, this is ______.
_______from media reports,the result has been unclear.
Listen! Do you hear someonefor help?