Make infinitives (with or without "to") or gerunds (add "-ing") of

Make infinitives (with or without "to") or gerunds (add "-ing") of the verbs in brackets to make the following sentences grammatically correct.
1. She doesn't allow (smoke) in the house.
2. l'm in a difficult position. What do you advise me (do)?
3. I've never been to Iceland but I'd like (go) there.
4. She said the letter was personal and wouldn't let me (do)?
5. We were kept at the police station for two hours and then we were allowed (go)
6. Where would you recommend me (go) for my holidays?