31.A central heating and cooling _____ produces warm or cool air in one central area and distributes it throughout the building.

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.

66.There is now a growing _______ of the importance of recycling among the residents in our neighborhooD.

65.The client was very hard to please and has been complaining ______, despite all our efforts to satisfy her demands.

64.Most of us take electricity for granteD. But do you know that about 1.5 billion people in this world have no ______ to electrical power?

63.While I was working in a fast-food restaurant, I constantly dreamed of being able to own one ______.

62.Our train is already behind _______. I wonder whether we will be in time for Tom’s wedding.

61.I thought the party I was invited to was a quiet and private one, but as it turned out, I was ______ by the crowds and noise.

60.A good relationship is built on honesty, trust, and _______ respect.