Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
People who leave home in the morning slamming doors behind them are likely to be less （ ） than those who leave home with a smile. (product)
【正确答案】：PRODUCTIVE
【题目解析】：
本题考查名词的形容词形式。
根据前文be less，此处应该填形容词，product的形容词为productive。
句意：早上离开家摔门而出的人比带着微笑离开家的人低产。