Dưới đây là câu trả lời cho từng câu gốc trong bài tập:

1. **Câu gốc:** "When did you last ride a bike?"
- **Câu có nghĩa tương tự:** B. What time did you ride your bike?

2. **Câu gốc:** "The water was very cold, so we couldn't swim."
- **Câu có nghĩa tương tự:** D. The water wasn't warm, but we could swim.

3. **Câu gốc:** "We haven't seen our uncle for three years."
- **Câu có nghĩa tương tự:** B. The last time we met our uncle was three years ago.

4. **Câu gốc:** "This is the first time they've been to England."
- **Câu có nghĩa tương tự:** D. They've been to England many times.

5. **Câu gốc:** "Our house is going to be rebuilt by a local firm."
- **Câu có nghĩa tương tự:** D. B and C are correct.