Engelsk grammtik - ret fejl i sætninger

Godaften!

Jeg sidder her med 20 engelske sætninger, hvor jeg skal rette en fejl i hver og forklare, hvad og hvorfor jeg ændret det. Jeg har 7 tilbage, som jeg ikke kan finde ud af, så hvis nogle af jer gad hjælpe mig med at rette og skrive hvorfor i har rettet det, så ville jeg blive super glad! - forresten, så er der kun én fejl i hver. 

1. He had travelled a lot as young man, but that was a long time ago.
2. Last year he spend three months on a ranch in Texas working as a catlle herder.
3. The audience is reminded of that smoking is not allowed during the show.
4. If I continued reading at this speed, there were every possibility of my finishing the book in time for the test. 
5. I was wondering of you could suggest a restaurant there is close to Times Square?
6. On the bus a completely stranger sat down next to me and started talking about his daughter.
7. However much you do, will there always be some loose ends to die.