| 21. | Experts admit they know frustratingly little about postpartum depression and its causes.
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| 22. | Getting a working spacecraft to Mars has proven frustratingly difficult.
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| 23. | However, frustratingly for him, his sentence remained unchanged.
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| 24. | His descriptions of legal matters are often frustratingly shorthanded.
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| 25. | Frustratingly little is known of Norris'early life.
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| 26. | One that's still frustratingly incomplete, too.
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| 27. | And frustratingly, some recipes work better than others.
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| 28. | Confidential administration briefings given to China and to Congress have been frustratingly incomplete.
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| 29. | The book is frustratingly hard to summarize because it keeps glancing off course.
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| 30. | Why have so many films been so frustratingly compromised?
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