1.   Selim had formidable obstacles to overcome, however, in modernising the archaic structure of the Ottoman empire.

2.   The Pennines presented the most formidable obstacles of all to the canals, but even they were successfully overcome.

3.   The stairs were a formidable obstacle to son Michael, also, since we lived in a bungalow.

4.   There are formidable obstacles on the road to peace.

5.   There are formidable obstacles to legal reform.

6.   To be sure, formidable obstacles lie ahead for advocates of a merger.

7.   When it came to assembling facts and details, the system was a formidable obstacle.

8.   Although the committee action was a major milestone for Foster, the Nashville physician still faces some formidable obstacles.

9.   And few are facing more formidable obstacles.

10.   And did Ohio State loom as a formidable obstacle?