____ to get a ticket for the 2013 FIFA World Cup, George has been standing in a queue for two days. 

Unless _________ by the police, you should keep silent over the accident.

.The vocabulary and grammatical differences between British and American English are so few and unimportant as hardly______.

Thanks to the measures ______ by the local government , the polluted river is becoming clearer and clearer and fish have begun to show up in it.

  In freezing weather, snow can turn into ice, which is easy to ________.