After the exam, my teacher told me that failure ____ the mother of success.
23. _______ the plane have taken off on time? --- I’m afraid not. The fog was too thick then.
24. The car ran into a crowd of middle school students, _______ to hospital immediately.
25. The sooner one _____ to the new working conditions, the better it will be _______ his working efficiency.
26. After having finished mopping the floor, he puts the mop back ______ it belonged.
27. I was so busy last year that I was almost mad. So I spent _______ I had with my family last month after I finished the project.