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Don't leave.

不要離開。

How much is a one-way ticket to Beijing?

一張到北京的單程票要多少錢？

I know the boy whose father is a scentist.

我知道那個男孩的父親是科學家。

I will be getting married in July.

我將在七月份結婚。

In secondary school, children study history and geography.

中學的小孩會讀歷史和地理。

That's why I am here.

那是我在這里的原因。