Lots of the scientists in our country are working hard to ____the planet Mars .
35. If English ______ included in the examinations, few students would choose it.
34. The student will be suspended from school____he apologizes to his desk-mate before the class.
33. --- How can you be late for such an important conference? --- Sorry! But my flight was ______ by fog.
32. The small fishing village has ______ into a modern city in thirty years.
31. So serious ________ that even the best doctors failed to save his life.