In the following exercise, tell which of the italicized pronouns introduce restrictive, and which introduce non-restrictive clauses:
1. This is the best bargain that we have ever offered.
2. This is Mr. Burton, whose work I recommended to you.
3. The city that I enjoyed most was Quebec.
4. I enjoyed walking on the old wall that still surrounds the town.
5. The club to which I belong will hold a meeting next week.
6. The club that I belong to will hold a meeting next Monday.
7. All those whose daily work showed an improvement were given an increase in salary.
8. The horse that ran away belonged to my partner.
9. The greatest man is he who feels himself the least.