Here are the answers for the questions based on the context provided:

1. **During rush hour, traffic can be very heavy and slow-moving.**
Answer: **B. rush hour**

2. **The mall is a popular spot for shopping and entertainment.**
Answer: **B. entertainment centre**

3. **In a downtown, you will find many modern buildings and busy streets.**
Answer: **D. traffic light**

4. **Public transport helps control the flow of traffic at intersections.**
Answer: **A. public transport**

5. **Living in a city is often higher compared to rural areas.**
Answer: **C. price**

6. **After spending a lot of time outside, I experienced itchy eyes.**
Answer: **A. itchy eyes**

7. **Noise in this area is quite high, which can be a concern for families.**
Answer: **B. noisy**

8. **It's important to be careful when crossing busy streets.**
Answer: **B. careful**

9. **The city has many parks like parks and playgrounds.**
Answer: **B. entertainment centre**

10. **The new metro system helps people travel quickly across the city.**
Answer: **B. public transport**

11. **The recycling program helps reduce the amount of waste produced in the city.**
Answer: **B. recycling program**

12. **Many people like to hang out in the park on weekends.**
Answer: **B. hang out with**

13. **A green space can be crowded, especially on weekends.**
Answer: **A. green space**

14. **She began to catch a cold after being outside in the cold weather.**
Answer: **A. turn into**

15. **Air pollution can affect health and comfort.**
Answer: **C. Air pollution**

16. **Noise can cause irritation and discomfort.**
Answer: **D. noise pollution**

17. **An entertainment centre is a popular place for dining and social activities.**
Answer: **D. entertainment centre**

Feel free to ask if you need help with anything else!