50. He was only one of the candidates who was going to take the oral defense.

18. When things don’t go the way we ________, we find ourselves trying to force them and struggling to finish them.

3.教育系统中两个最基本的要素（ ）。

4. I ________ that the experience I was heading for was anything but boring, had I read the brochure carefully.

39. Difficulties can ______ a person’s best qualities.

42. ______, I agree with you about the plan.

25. —Mr. Smith, I’m sorry to bother you, but it’s the third day of June today.—Oh, _____ rent! I’m sorry it’s late. I’ll write you _____ check right now.

30. Fortune China released a ranking of business leaders in 2020,Jack Ma, founder of Alibaba, ______ the list with outstanding leadership.

9. He was lured into a crime he would not ______ have committed.

5. Great changes _____ in my home town and a lot of factories _____.

38. I have no alternative ______ to arrive late.

36. Lady Alice was ______with joy when her child was given back to her.