Here are the correct answers for the error identification and word patterns sections of your questions:

**ERROR IDENTIFICATION (5)**

1. **Question 1:** If the youngsters learn to live useful and independent lives, that must surely be the most desired outcome.
**Answer: D. desired** (The word "desired" should be changed to "desirable.")

2. **Question 2:** Her boss admitted insulting her but said it was merely a motive technique to get her to do better.
**Answer: C. motive** (The word "motive" should be changed to "motivational.")

3. **Question 3:** Single mothers have been given preferable access to council housing.
**Answer: C. preferable** (The word "preferable" should be changed to "preferential.")

4. **Question 4:** The audience was becoming restful as they waited for the performance to begin.
**Answer: B. restful** (The word "restful" should be changed to "restive" or replaced with "restless.")

5. **Question 5:** We hope very much to find a satisfied solution to the problem.
**Answer: C. satisfied** (The word "satisfied" should be replaced with "satisfactory.")

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**WORD PATTERNS (8)**

6. **Question 6:** People are beginning to question the prime minister's choice _________ advisers.
**Answer: C. of**

7. **Question 7:** She rested her head _________ my shoulder.
**Answer: A. on**

8. **Question 8:** ‘We think people should have the opportunity to decide _________ themselves what they want.
**Answer: D. for**

9. **Question 9:** He seems to take great delight _________ in teasing his sister.
**Answer: C. in teasing**

10. **Question 10:** The new government has decided to _________ all political prisoners free.
**Answer: B. set**

11. **Question 11:** It was an outfit that I had bought _________ on impulse, and never worn.
**Answer: C. on**

12. **Question 12:** The money will go to those who are most _________ need.
**Answer: D. in**

13. **Question 13:** Customers can opt _________ their statements online rather than through the mail.
**Answer: A. to receive**

Feel free to ask if you have more questions or need further clarification!