9. Immediately after he got to Wuxi, he wrote to me.

他一到无锡就给我写信了。

还能这样说：

He wrote back to me as soon as he arrived in Wuxi.

The instant that he reached Wuxi, he wrote to me.

应用解析：

immediate cause 直接原因；

immediate family 至亲，直系亲属；

take immediate action 采取紧急行动；

immediate reply 立即答复

10. I'm looking forward to hearing from you soon.

望早日回信。

还能这样说：

Please reply at your earliest convenience.

Please write back as soon as possible.

谚语：

Fear always springs from ignorance.

恐惧源于无知。

11. How long has it been since you've heard from your sister?

从你上次接到你姐姐的信以来有多长时间了？

还能这样说：

How long have you had your sister's last letter?

How long didn't you hear from your sister after she wrote to you?

应用解析：

Hear and tremble!

好好听着，牢牢记住！

12. I enclosed some photographs in my letter.

我在信里夹了几张照片。

还能这样说：

There were some photographs in my letter.

I put some photographs in the envelope.

应用解析：

the enclosed 附件；

half enclosed 半包封的