--- People should spare no efforts to protect the environment.--- ________. Air pollution does harm to our health.
The poor man , ________,ran out of the dark cave.
His report was so exciting that it wasinterrupted by applause(掌声).
_______ in a friendly way, their quarrel came to an end.
Themankeptsilentintheroomunless_______.
Inthetrafficaccident,hisfathercamecloseto________.