He started to learn English in 1990 and in the years ________ he kept on using it in his work.
--- How can you be late for such an important conference? --- Sorry! But my flight was ______ by fog.
So serious ________ that even the best doctors failed to save his life.
Their work ______, all the experts went out for relaxation.
The growing interest in ____ history is clearly evident in ____ number of people visiting museums and country houses.
If English ______ included in the examinations, few students would choose it.