Achieving a high degree of proficiency in English as a foreign language is not a mysterious _____ without scientific basis.
Some areas, _____ their severe weather conditions, are hardly populated.
Many university courses are not really _____ to the needs of students or their future employers.
If we can _____ our present difficulties, then everything should be all right.
The current political _____ of our country is favorable for foreign investments.
It was with great delight that I read in your February _____ the letter to the Editor written by Prof. Johnson.