Correct or Incorrect?

He wrote the letter because he wanted to avoid to be discovered.

Listen, it's no use to cry for it. There are more important things in life.

The guard refused to sell a ticket for the concert.

They suggested to take a trip to the south of the country.

Famous people deserve to have a private life without journalists following them everywhere.

I don't feel like going camping because I prefer holidays where I can relax.

I can't help to think that sometimes life can be hard for some people.

He pretended knowing nothing about it but I knew he did.

Not all the students could afford going abroad on the trip.

I don't know why the teachers delayed to tell us the results.

I didn't feel well, but I managed getting downstairs.

I hope to visit the museum next time I visit you.