I________(已经收到) your e-mail of Aug.17th.
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I’m glad to receive__________ (你的电子邮件).
I’m very sorry for I didn’t ______________ (早点回复你的邮件).
This e-mail is to___________ (告知你) that I’m thinking about studying in the U.S. next year.
I___________(将不胜感激) if you could give me your best quotations .