根据下列句子所给单词的首字母或中文,写出各单词的正确形式（每空限填一词）。
He explained the a_________ word to the children with a concrete story.
When a______ herself to getting up early, she stuck to her early- to- bed schedule.
E______ the child will leave home to lead his own life as a fully independent adult.
Food shortages were w_____ in the area after the earthquake hit it.
To have hills______ (转变) into fields is extremely challenging.
Earthquakes happen when _____(压力) in rock are suddenly released as the rocks break.
The students can express a _________ (偏好) for the school they are to attend.
Large numbers of young people have _____(涌入) into the area in search of jobs.