What we saw and what we heard/ What we experienced during the Spring Festival made us deeply understand/ fully aware that millions of ordinary people are the greatest and that happiness is achieved through hard work.
解析：
16.答案：So quickly is artificial intelligence changing the whole world that it is hard for you to predict what life will be like in the future.
解析：
17.答案：It’s no use complaining about too much homework, you may as well learn how to manage your time properly.
解析：
18.答案：Whether it is a waste of resource for a college student to be a security guard after he graduates from college is the topic of the debate that I hosted yesterday.
解析：
19.答案：In recent years, the idea that electronic whiteboard system should be applied to classroom teaching efficiently and flexibly has been widely accepted, hasn’t it? (同位语从句可以后移;副词也可提前)
解析：
20.答案：We firmly believe a more hannonious society will be built people will live and workhappily and they will besatisfied with their life physically and mentally. 解析：
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