2 sentences

1. 听了你这番话，我才算真正开窍了。

   tīng le nǐ zhè fān huà, wǒ cái suàn zhēn​zhèng kāi​qiào le.

   After hearing what you said, I finally truly understand.

   Source: Dong Chinese Dictionary

2. 这孩子以前很顽皮，到了初中好像突然开窍了。

   zhèi hái​zi yǐ​qián hěn wán​pí, dào le chū​zhōng hǎo​xiàng tū​rán kāi​qiào le.

   The child used to be very naughty, but he seemed to suddenly wise up in junior high.

   Source: Dong Chinese Dictionary