But connecting the dots between the ads and those activities has been difficult.
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For non-premium content, it has been difficult to achieve sustainable profitability under these circumstances.
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The exact relationship between PEDs and interference has been difficult to pinpoint, A4A acknowledged.
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With or without the tough language, it has been difficult to contain the drug problem.
Moving the needle at all has been difficult for retailers the last couple of years.
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This has been difficult to come to accept, but that is the truth of it.
It is has been difficult to prosecute cases of abuse in the ultra-Orthodox community.
Alabama Gov. Robert Bentley said reaching a settlement that satisfies all states' competing interests has been difficult.
Even though she's utterly opposed to the regime in Cuba, Fidel's illness has been difficult for her.
Cutting those fees has been difficult, since many investors are loth to part with familiar, time-tested benchmarks.
Many companies are reluctant or uninterested in discussing the issue, and concrete information has been difficult to obtain.
Funding for protection of children in conflict zones has been difficult to secure.
"We need a united opposition, which has been difficult to achieve, " U.S. Secretary of State Hillary Clinton has said.
The road to this victory, Iowa, has been long, it has been difficult.
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It has been difficult to prosecute cases of abuse in the ultra-Orthodox community.
And I know that the mission has been difficult over the last decade.
"It's been frustrating at Huddersfield, I've been in and out and on the bench, which has been difficult, " he added.
It has been difficult times for the team but it is settled and it is in the past for us.
Perhaps recruiting traditional head teachers has been difficult, not because the job is too large, but because it is too small.
Staying in touch with loved ones has been difficult - the internet and mobile networks have been affected - and distressing.
With no direct counterpart today, it has been difficult to nail down the ammonites' true place in the ancient food chain.
Kim has had a hard time exercising recently because her uncle, 90, passed away, and the grieving process has been difficult.
Since then, teachers have been responsible for assessing pupils, but across the board, a consistent approach has been difficult to find.
But up until now, it has been difficult to figure out precisely how much is coming from each plant or company.
Eli Manning said it has been difficult to see the TV pictures of the devastation in the city where he grew up.
The mission in Iraq has been difficult and trying for our Nation.
It has been difficult, but I hope our prayers ... can be effective in saving the life of the brother President Chavez.
"This period has been difficult for us because the wounds are so fresh, " her father Lawrence Pott told the heavily attended news conference.
Historically, it has been difficult to monitor emissions properly, and in any case they believe the Environment Agency, which polices incinerators, is underfunded.
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Home help has been difficult to find, and her children, with busy careers and young families of their own, can offer only limited assistance.
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