1．(2020·全国卷Ⅱ)The (beauty) long branches covered with pinkcolored buds(蓓蕾) make fantastic decorations.
解析：beautiful 设空处和long一起修饰后面的名词branches，应用形容词。
2．(2020·新高考全国卷Ⅰ)In the 18th and 19th centuries， (wealth)people travelled and collected plants, historical objects and works of art.
解析：wealthy 分析句子结构可知，修饰名词people要用形容词。
3．(2020·全国卷Ⅲ)One day the emperor wanted to get his portrait (画像) done so he called all great artists to come and present their (fine) work, so that he could choose the best.
解析：finest 根据语境可知，皇帝命令所有的知名画家献上他们最好的作品，故填fine的最高级finest。
4．(2019·全国卷Ⅰ)Scientists have responded by noting that hungry bears may be congregating (聚集) around human settlements, leading to the illusion (错觉) that populations are (high) than they actually are.
解析：higher 根据空格后than they actually are可知，应用形容词的比较级，故填higher。
