Translation of eficiente

Writing large essays has never been my favorite task although it is one of the most important when learning a language. Spanish, English and German are all entirely supported by Vocabulix.
I just saw the Arsenal match. It was very boring and the atmosphere in the stadium was weak. I think that it was mainly due to the cold and not due to the quality of the game. But it was worth it.
The Halong Bay Red Dragon boat's capacity was around ninety passengers and had a much larger crew. We did not have a choice at all and the couple from Washington and we decided to go for it.