He conducted a thorough investigation into the incident.

The police are thoroughly investigating the incident.

He lost everything.

She is planning a date with her current boyfriend.

My boyfriend gave me a gift.

Everyone was surprised by the news.

This problem is very complex, and it is difficult to solve.

There are multiple errors in this document.

This market is in a state of duopoly by two large companies.

It was revealed that he was polygamous, which became a big problem.