Fill in the correct relative pronoun or adverb. Put commas where necessary. Write D defining or ND for non-defining and say whether the relative pronoun/adverb can be omitted or not.

1. She doesn’t know Wales _________ her mother is from very well at all.
2. People _________ have any information should contact the police.
3. My favourite day of the week is Friday, the day on _________ the weekend begins.
4. He gave me some ideas _________ I found helpful.
5. People _________ park here will be fined.
6. Julian Blake is the singer _________ won the contest.