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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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.
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.
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.
"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.
Management have also said that it has been difficult to maintain productivity when at times up to 1, 000 workers are brought in on short-term contracts.
Honey is a complex substance, containing up to 800 compounds and its complexity means it has been difficult to pinpoint exactly how it kills bacteria.
The singer has not seen Rihanna for a couple of months, and said the separation has been difficult, especially when it comes to her dating others.
It has been difficult to establish precisely who was organising the conference, and whether it had received any prior approval from any official quarter, he says.
Coping with the warmer conditions has been a challenge and even the now familiar method of covering over the mountain pastures with snow cannons has been difficult.
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