In today’s fast changing and competitive world, to be able to learn faster and more effectively is not merely desirable; it is ________.
30. The world is ______ seven continents and four oceans.
25. ---You’ve missed such a good chance. ---Yes, I that job the boss offered me.
23. He is always full of ______ as if he never knew tiredness.
22. One learns a language by making mistakes and ______ them.
35. Although they met with difficulties, I hear that they’ve succeeded _______.