Here are the best options for each question:

1. **markets (A)** - "People sell interesting things at the..."
2. **B (Four)** - "How many people are there in Tracy's family?"
3. **A (At weekends)** - "When does Tracy's family go to the department store?"
4. **B (Many books)** - "What is in Tracy's room?"
5. **C (Because it is convenient)** - "Why does Tracy love her house?"
6. **B (No, she doesn’t)** - "Does Tracy’s mother put flowers near the cupboard?"

For the vocabulary and grammar part:

11. **A (natural wonders)** - "Trang An in Ninh Binh is one of the most..."
12. **B (speaks)** - "Minh is..."
13. **A (finish)** - "Shool..."
14. **C (taller)** - "I am my brother..."
15. **B (some salt)** - "Could you pass me..."
16. **C (suncream)** - "is very useful when you go swimming."
17. **C (lucky money)** - "Children receive..."
18. **B (next to)** - "My house is..."

Make sure to circle the mistakes in each sentence as indicated!