今天是学校开放日。

Jīntiān shì xuéxiào kāifàngrì.

The school is open to the public today.

我觉得北京人越来越开放了。

Wǒ juéde Běijīng rén yuèláiyuè kāifàng le.

I think people in Beijing are more and more open.

听说西方人思想比较开放。

Tīngshuō xīfāng rén sīxiǎng bǐjiào kāifàng.

I heard that Westerners are rather open-minded.