Sure! Here are the correct answers along with explanations for each question:

1. He is **B. the same age as** my father, but he looks young.
- "The same age as" is the correct idiomatic expression used to compare ages.

2. He is **B. the same age as** my father, but he looks young.
- Same as above. (Note: This question appears to be a repetition of question 1.)

3. Jack: “I thought the film was really boring.” Maria: **B. So did I**.
- "So did I" agrees with Jack's statement, indicating that Maria shares the same opinion.

4. Cakes in Viet Nam are made **C. of** butter, eggs, and flour.
- "Made of" is used to specify the ingredients or materials that something is made from.

5. My brother’s taste in art is quite different from **D. mine**.
- "Mine" is the correct possessive pronoun referring back to the speaker's taste in art.

6. Teenagers in Viet Nam like K-pop, and they like Korean films, **A. too**.
- “Too” means "also" and is correctly used to add another similarity.

7. Let’s collect and **A. give away** warm clothes to homeless children in our city.
- "Give away" means to donate, which fits the context of providing clothing to those in need.

8. **C. Fewer** accidents were recorded this year than that year; 23 cases compared to 42 cases.
- "Fewer" is used with countable nouns (like "accidents"), indicating a smaller number.

9. **B. Although** we see them at the gym every week, we don’t know their names.
- "Although" is used to introduce a contrast between two ideas.

10. He is **B. the same age as** my father, but he looks young.
- Same as questions 1 and 2.

In summary, the selected answers reflect proper grammatical usage and idiomatic expressions appropriate for each context.