31.   It took many years of struggle to establish majority rule in South Africa.

32.   This book took years to complete.

33.   I had heard an appeal could take years.

34.   It took me years to fully recover.

35.   The statistics to prove or disprove his hypothesis will take years to collect.

36.   It took years to understand many perplexing diseases.

37.   It takes a year for the Earth to make one circuit around the sun.

38.   It took years for the political situation in the country to normalize.

39.   She had taken several years off to raise a family, so there was a large gap in her work history.

40.   Science, mathematics, Chinese literature and the classics... with the poor schooling given to me, it would take me years to get ready for a university.