Write true (T) or false (F), according to the text:
( ) The expansion of Heathrow airport ought to be blocked until the busiest airport complies with key environmental conditions.
( ) The expansion of Heathrow should begin once Europe’s busiest airport may accept other conditions for weather.
( ) Europe’s busiest airport can accept this change under two conditions: better air quality and lower noise levels.
( ) Heathrow airport can choose the best alternative for environmental conditions.