Identify the nonessential words, phrases, or clauses in the following sentences and add the appropriate punctuation.

1. Patterson Tower the recently completed office building is a monument to concrete ugliness.

2. The movie that I wanted to see is no longer playing.

3. Each person who enters the contest must send in two box tops.

4. John decided nonetheless not to buy the car.

5. The Mississippi River which once flowed north into Hudson Bay flows south into the Gulf of Mexico.

6. Your cat watching the dog intently walked carefully away.

7. The cat that was watching the dog most intently walked carefully away.

8. TV commercials sometimes the most entertaining parts of a program are essentially flashy corporate propaganda.

9. The dam project which many in the government consider to be a sign of national strength will destroy hundreds of villages and vast areas of wildlife habitat along the river banks.

10. The free-jazz musician Sun Ra claimed to be from Saturn.