根据句意及首字母或汉语提示，完成下列单词。
（1）The e____ is the biggest animal on land.
（2）The old man p____ trees in spring every year.
（3）My hobby is c____ stamps（邮票）.
（4）It's d____ to play football in the street.
（5）Will you i____your teachers to your birthday party?
