Here are the mistakes identified in the passage:

1. **Question 30**: The error is in option (D). It should likely read "the crime" instead of just "crime."

2. **Question 31**: The sentence is correct.

3. **Question 32**: "Nam is far from his family, so he remembers his parents in his hometown so much." should be more clearly structured. Suggestion: "Nam is far from his family, so he often remembers his parents in his hometown."

4. **Question 33**: There's a mistake in (A). It sounds better as "Bob wasn’t out of his house since he was given a new computer," indicating a contrast.

5. **Question 34**: The mistake is in (C). It should be "didn't do exactly well."

6. **Question 35**: The sentence seems correct.

7. **Question 36**: This sentence is correct.

8. **Question 37**: The error is in (C). It should read "interested in Mathematics and their applications."

9. **Question 38**: The error is in (B). "although" should replace "but."

**For Section IV**:

1. **Question 1**: The phrase should flow better with "give up."

2. **Question 2**: “The bomb exploded in the garage; fortunately, no one was hurt.” should use "the garage" instead of just "garage."

3. **Question 3**: "get out" is correct.

4. **Question 4**: This sentence seems correct.

5. **Question 5**: "quit" is appropriate.

Identifying these mistakes can help clarify the intent and improve the grammar and structure of the sentences.