1. he was so brave that he could tell her what he though about her (it)
It was brave of him to tell her what he thought about her.
2. Your bad news upsets me very much (sorry)
I'm very sorry to hear your bad news.
3 When will you book the flight for your trip to Vietnam? (be)
When will the flight for your trip to Vietnam be booked?
4 I'm interested in the news about ancient towns (find)
I find the news about ancient towns interesting.