24.As the outdoor concert attracted crowds of teenagers, the organizer made sure police and volunteers were ______ throughout the event, just in case.

76.When the stock market goes down, investors are usually ______ to sell out their stocks.

75.There is a growing _______ to regard money more highly than quality of life.

74.It is true that human beings have had war constantly throughout history; nevertheless human civilization has managed to ______.

73.We were deeply shocked and saddened when we ______ of the sudden death of our newly retired professor.

72.Hydroelectric power plants ______ electricity in a much cleaner way than coal-fired ones.

71.The poster _______ people to put down their smartphones and have more face-to-face communication with each other.

70.While there are a couple of antibiotics that usually work, if they are overused they may ______ to be effective.

69.The team is carrying out research to find out the impact on children of long ______ from their parents.

68.What disturbs investors is the fact that the market has been fluctuating irrationally ______.

67.The Japanese ______ during World War II met with fierce resistance from the Chinese people.