What is far more important is how they work with scarce resources, with ambition and with eagerness to learn from one other.
Mr Obama will therefore be drawing up a list of replacements with some eagerness.
But with such eagerness, much could go wrong.
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The proliferation of city and state building energy efficiency codes, combined with the eagerness of building owners to seek LEED ratings, tells me that policymakers and the market are increasingly demanding energy efficiency in new construction.
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My early strategy to get his attention (with nothing but eagerness in my skillset) was to bake.
In fact that would be as wrong-headed as the eagerness with which they snapped them up only a few months ago.
The eagerness with which the U.S. military seemed willing to talk about the letter to the media in places like Dubai also aroused suspicion among the already, to put it mildly, wary Arab media.
Not everyone is impressed with Hu's eagerness to toe the party line.
Some think it helps explain the NYSE's eagerness to merge with an electronic exchange.
Israel is particularly worried by Iran's eagerness to warm relations with Sudan and Eritrea, a strategic spot on the Red Sea that could threaten Israeli shipping.
With the same high-spirited eagerness, and a flask full of local fire-water, he would run into taverns, caves, shepherd huts and gypsy camps, hungry to pick up the unknown language and join in.
Draghi must balance an eagerness to curry favor with the German contingent at the ECB against growing financial market pressure to intervene on a bigger scale to lower the borrowing costs of Italy and Spain.
The PA's security forces have been praised by the Americans for restoring a modicum of order by confronting and disarming militant groups as a token of their eagerness to make peace with Israel and build a state of their own.
Down did look dangerous when they managed to break into the Tyrone half with the Red Hand half-backs' eagerness to get forward, leaving gaps for the Mournemen to exploit.
However Anna Brychan, director of head teachers' union NAHT Cymru, warned that her members were concerned about the practical difficulties involved with the proposals, despite their "great eagerness to make maximum use of new technologies in education".
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With a firm grasp of science matched by her eagerness to inform, she transforms her other adventures in places like Madagascar, Hawaii and Lombok into diverting lessons in the biodiversity of island ecosystems.
The eagerness to attract foreign capital to the project fits with the desperate need for Russia to boost its credibility with international business.
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Even those in predominately conservative areas who might otherwise be suspicious of businesspeople from a country led by a communist party are eager to show how welcoming they can be with some even studying Chinese, hoping to better convey their eagerness to accommodate newcomers.
Fans in traditional markets such as Boston and New York are eager for the season to start, along with some non-traditional fan bases, which have demonstrated an early eagerness to support their teams this upcoming season.
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Most of them enter with sweat and gusto into the spirit of the thing fortunately so, for without such eagerness the movie would feel merely cruel.
Ms Mnouchkine's ability to surprise and to mark her productions with her particular style owe much to her continuing exploration of the performing arts the world over and her eagerness to blend widely-differing inspirations into a harmonious whole.
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