1.（2019全国I卷）In recent years some Inuit people in Nunayut have reported increases in bear sightings around human settlements, leading to a _____ (believe) that populations are increasing.
【答案】belief
【解析】考查词性转化。根据其前不定冠词和其后的同位语从句可知，空格处为名词形式，故填belief
2.（2019全国II卷）We are so proud of her. It's (wonder).”
【答案】wonderful
【解析】考查词性转化。根据句子结构可知，在系动词is之后用形容词形式作表语，需要把名词wonder转化为形容词wonderful。故填wonderful。
3.（2019全国III卷）When they were free from work，they invited us to local events and let us know of an interesting ，together with the story behind it. (compete)to watch
【答案】competition
【解析】考查词性转化。由空格前的不定冠词an与空格后的不定式to watch可以确定空格处应该填名词形式。故填competition。
