| rigorous standard | 3.75 | They also advocate setting rigorous standards. | ||
| rigorous training | 3.62 | Tanum said hunters must undergo rigorous training. | ||
| rigorous test | 2.50 | Now there are calls for rigorous tests to be introduced. | ||
| rigorous schedule | 2.30 | The rigorous schedule took its toll. | ||
| rigorous program | 2.17 | The university offers a rigorous academic program. | ||
| rigorous review | 1.97 | But the FAA has decided that more rigorous review is required. | ||
| rigorous study | 1.45 | But andro flunked the two most rigorous studies of its effectiveness. | ||
| rigorous workout | 1.45 | He will be put through rigorous workouts. | ||
| rigorous process | 1.25 | Military officials describe a rigorous process of picking targets. | ||
| rigorous inspection | 1.12 | As a result, U.S. exports will have to pass more rigorous inspections. | ||
| rigorous analysis | 1.05 | We subjected the data to a rigorous analysis. | ||
| rigorous examination | 1.05 | Victims do not have to fear rigorous cross examinations. | ||
| rigorous exercise | 1.05 | A rigorous exercise program for pelvic muscles has made the hip feel better. | ||
| rigorous scrutiny | 0.92 | This system has been subject to rigorous scrutiny. | ||
| rigorous control | 0.79 | All infrastructure and industry projects are subject to rigorous controls. | ||
| rigorous course | 0.79 | Riley recommended rigorous pre-college courses for seniors. | ||
| rigorous curriculum | 0.79 | That means a more rigorous curriculum focusing on grammar, usage and writing. | ||
| rigorous enforcement | 0.79 | Some Vietnamese question how rigorous enforcement of the ban will be. | ||
| rigorous exam | 0.79 | Starting this year, students will have to pass a more rigorous English Regents exam to earn a high school diploma. | ||
| rigorous system | 0.79 | The gallows and the cane are merciless attendants of a rigorous judicial system. |