给定一个英文单词，生成三个该单词的同义词，并分别用这四个单词造一个句子。


英文单词: happy
同义词: joyful, cheerful, elated

句子:
1. I felt joyful when I received the good news.
2. She always greets everyone with a cheerful smile.
3. He was elated when he heard that he got the job.
4. Happy birthday to my best friend!