求英语达人，翻译

你一旦作出承诺，你就要设法履行承诺。
Once you make a commitment, you have to try to fulfill their commitments

他是通过电子邮件把我被录取的消息告诉我的
He was admitted via e-mail to the news I was told my

Since you have promised,you should try your best to do it.

once you have promised,you should try your best to do it.
he told me that I got the job in form of e-mail

Once you have made a promise, you must try to keep it.
He informed me of my admission by email.