【推荐1】Physical activity is an important ________(因素) in keeping fit. （根据汉语提示单词拼写）

【推荐2】The single most important ________（因素） that separates ordinary photographs from good photographs is the lighting. （根据汉语意思填空）

【推荐3】Unemployment is the most important _____(因素) in the growing crime rates. (根据汉语提示单词拼写)

【推荐1】________ (固体) turn to liquids at certain temperatures. （根据汉语提示单词拼写)

【推荐2】In fact, more than one a________ (描述) suggests that while Newton was certainly inspired by a falling apple, there is no proof that it hit him on the head. （根据中英文提示填空）

【推荐3】There is a general a________ that smoking is harmful. (根据首字母单词拼写)