1. Sorry,but we've lost your letter. MISLAY
2. The police are grilling Harry down at the station. QUESTION
3. You'll get a rise in salary after six months. RAISE
4. They stopped playing the match after half an hour. ABANDON
5. They stopped traffic from using the centre. BAN
6. They took Chris to court for dangareous driving. PROSECUTE
7. You usually eat this kind of fish with a white sauce. SERVE
8. I don't know your name. INTRODUCE

This is my opinion :
1.Unfortunately your letter has been mislaid.
2.Harry is being questioned down at the station.
3.Your salary will be raised after six months.
4.The match was abandoned playing after half an hour.
5.They banned traffic from using the centre.
6.Chris was prosecuted to the court for dangareous driving.
7. This kind of fish is usually served with a white sauce.
8.I haven't been introduced. ( I don't know why this sentece is transformed in this way . I've just written it in this way because my teacher tell me this way! If somebody can explain it to me more clear I would be glad)

If somebody notices mistakes let's show them to me !

thanks I don't know that prosecute is followed by the preposition ''by'' but from now I know.
But the fourth sentence - are you sure about it.I couldn't understand in a clear way why you used ''of playing'' in the end of the sentence. Which is the most appropriate way - I haven't been introduced or You aren't introduced to me.