1. The best title for the passage would be: B. Languages: the Younger the Better

2. The word "grown-ups" in paragraph 1 is closest in meaning to: A. adults

3. According to the passage, "a handsome amount of money" means: B. a big sum of money

4. Children learn a foreign language fast because: C. they have a special ability

5. If you wish to learn English, you should: C. begin as soon as possible

1. He makes a lot of mistakes in pronunciation. His foreigner friends often don't understand him. -> If he didn't make a lot of mistakes in pronunciation, his foreigner friends would often understand him.

2. I have just lent him my English-Vietnamese dictionary, which I bought one month ago.

3. If you are allergic to seafood, there are many other dishes for you to enjoy. -> If you are allergic to seafood, you can enjoy many other dishes.

To learn English well, it's important to practice regularly. Try to immerse yourself in the language by watching English movies, listening to English music, and reading English books. Practice speaking with native speakers whenever possible, and don't be afraid to make mistakes. Set achievable goals for yourself and celebrate your progress along the way. Remember, consistency is key, so keep practicing and never give up!