1．(2018年新课标Ⅱ卷·语法填空)This switch has decreased ________ (pollute) in the country's major lakes and reservoirs and made drinking water safer for people.
2．________ average each report requires 1，000 hours to prepare.
3．Though he is less than one year old, he is strong enough to walk ________ (steady).
4．(2019年新课标Ⅰ卷·阅读理解D)Enviable as the cool kids may have seemed, Dr.Prinstein's studies show unpleasant ________ (consequent).
