Bankers give me two reasons for their doubts about how far the schemes will revive our anaemic economy.
But Zayed al-Zayani, chairman of the Bahrain International Circuit where the F1 race will be staged, said Tuesday that criticism of the authorities was misplaced, blaming "scaremongering tactics" for raising doubts over whether the race should proceed.
For all the doubts about their presidential candidate's ability to connect and for all the audible sighs in the Fleet Centre on Wednesday night, the Democrats are lucky that they have the dour Mr Kerry, rather than the charming Mr Edwards, at the top of the ticket.
If there are any such doubts for Ms. Chen, she has long since erased them.
Both are doubts for Cardiff ahead of their opening league fixture against Scunthorpe United on Saturday.
Defenders Kevin McNaughton (knee) and Paul Quinn (illness) are doubts for Saturday's visit of Doncaster Rovers.
"All three are doubts for the start of the season, " said boss Harry Redknapp.
But Serevent had been under suspicion from the start, and earlier beta agonists had stirred doubts for decades.
The pair are now serious doubts for Britain's team in the European Championships in Munich, which begin on 6 August.
Both athletes had been considered doubts for Paris with Ennis recovering from an ankle complaint and Aikines-Aryeetey a hamstring problem.
And with strikers Wayne Rooney (hamstring) and Dimitar Berbatov (knee) now also doubts for the match against Aston Villa, Ferguson's squad is stretched to near breaking point.
There were never doubts for Kentucky, whose path to New Orleans has been clear ever since coach John Calipari inked a freshman class full of pre-fab, plug-and-play basketball Brahmins.
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Now the case for skepticism rests on doubts about whether the set of reforms that are necessary for the euro to work overlaps with the set of policies that are politically viable.
Marco Biagi, the SNP MSP for Edinburgh Central, said he had serious doubts about the figures for both scrapping the scheme and for completing it.
For those with lingering doubts, the deal shows just how potent Internet companies have become.
It turns out that this may be the perfect time for a candidate with doubts.
Jeremy Browne, the Foreign Office minister responsible for Falklands policy, doubts that, say, Brazil or Uruguay has much interest in a regional economic blockade of the islands.
Moody's, for example, said doubts about the political sustainability of future cuts were a big factor that might lead them to downgrade the UK's credit rating even further.
Secondly, the detection of multiple planets demolishes once and for all the lingering doubts of some astronomers that the single planets found around other stars are not planets at all, but small, faint components in otherwise conventional binary star systems.
The collapse of the financial sector could cost the country up to 18% of GDP while a shortage of credit will damage the rest of the economy, creating fresh losses for banks and raising doubts about debt sustainability even if a deal with the euro zone is agreed.
And in July, Falklands veteran Simon Weston withdrew from elections for the post in south Wales after doubts were raised about him being convicted and fined for being a passenger in a stolen car when he was 14.
But if doubts persist, for both banks and sovereign, he may not have much time.
Rooney's return will be a welcome boost for Ferguson, who has doubts over Ryan Giggs and Rafael.
The council's reasons for rejecting planning permission were doubts over figures in a traffic survey, as well as the large scale of the development and the loss of open space and amenities.
He will acknowledge, too, their fears for the future, the doubts that perhaps their children may be less well off than them, with rising tuition fees, unaffordable house prices, and few jobs.
According to Raghu Chundawat, a Delhi-based wildlife scientist who is not connected to the project, any long-term suspension of the radio-collar programme would be a "disaster" for the Sundarbans, and doubts about the safety of the drugs are "absolute nonsense".
He also said the situation raised doubts about the franchise for the ScotRail service.
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