I. Complete the sentences with the words in the box.
generous/ orphanage/ sociable/ planet/ next-door/ humor/ joke.
1.The Earth is the name of the ______ we live on.
2. He has a good sense of ______. He always makes people laugh.
3.After the death of his parents, he was sent to an ________.
4.Don’t do it as a ______. It’s a serious thing.
5.She lives next to my house. She is my ______ neighbor.
6.It was _____ of you to share your food with me.
7.Mai has a lot of friends. She is very ______.