An e-mail adress______(need)when you send and receive e-mails.动词填空

怎么填啊??请英语学家帮帮忙!
各位英语学者,按考试来看,这句话能否用will be needed(按条件状语从句),也许是无稽之谈,能说明一下理由吗??十分感谢
那如果说是I_________(call) you when I get there.怎么办

When you send an e-mail you should provide the sender's e-mail address . An e----mail to my friend的意思 E-mail前面是用a还是an 还是不可数? They sent me an E-mail,( )to get further information 帮忙80词 Writing an e-mail message 翻译，read the following e-pal ads.Write an e-mail to one of them. 翻译，read the following e-pal ads.Write an e-mail to... An e-mail adress______(need)when you send and receive e-mails.动词填空 Here is E-mail of mine.这句话应该填AN还是THE？ He sent me an e-mail,_____ to get further information.