2 sentences

1. 在和他做生意之前，你最好先摸清他的底细。

   zài hé tā zuò shēng​yi zhī​qián, nǐ zuì hǎo xiān mō​qīng tā de dǐ​xì.

   Before doing business with him, you'd better find out about his background.

   Source: Dong Chinese Dictionary

2. 经过一段时间的调查，他终于摸清了事情的真相。

   jīng​guò yī duàn shí​jiān de diào​chá, tā zhōng​yú mō​qīng le shì​qing de zhēn​xiàng.

   After some investigation, he finally uncovered the truth of the matter.

   Source: Dong Chinese Dictionary