阅读短文,然后从方框中选出可以填入文中空白处的单词

阅读短文,然后从方框中选出可以填入文中空白处的单词
单词：kind used just line heard happy came piece from well
We can often see dog owners taking their dogs for a walk.But have you___69___ of taking penguins(企鹅) for a walk?Here is a ___70___ of news from Japan.In Tokyo Zoo,penguins go out for a walk in __71__ every day.It is said that this can make them happy and stop them___72___ being homesick(想家的).The penguins in the zoo didn’t eat ___73___ and were not kind to workers when they first came to the zoo,maybe they were not ___74___ to the life in the zoo.So the zookeepers ___75___ up with this good idea.They___76___ let them walk as they did in South Pole.Now,all these penguins have become___77____