1. Rural areas were often victimized in the past by rampant counterfeiting because it was difficult to ensure the quality of goods in every grocery store.
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2. " It is still in experiment phase and it's difficult to ensure the safety, " she said.
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3. The artificially lower prices have resulted in heavy losses of domestic refineries and made it difficult for the oil sector to ensure domestic supplies.
4. difficult to ensure
4. As the service provided is a sensitive and often difficult one, the BESA chooses its volunteers carefully to ensure they suit the job.
5. The authorities had complained of having a difficult time to ensure proper management because of lack of funds.