The technician has already repaired the machine for the client.

Use the following self-assessment exercises to improve your knowledge of and power over English grammar, mechanics, and usage. Review all of Section 1.1 in the Handbook of Grammar, Mechanics, and Usage that appears at the end of this book.
Answers to these exercises appear on page 499.
For the following items, indicate which words are common nouns and which are proper nouns.