Here are the answers to the questions based on the cues provided:

**Question 27:** The correct answer is **C. It is necessary to learn English to communicate with people from different countries.**

**Question 28:** The correct answer is **B. The more carefully you drive, the safer you are.**

**Question 29:** The correct answer is **C. You can park bikes anywhere.** (This option is inferred to reflect the intent of the sign about bike parking, but without the context of the visual, you might want to double-check the exact wording of the sign.)

**Question 30:** The correct answer is **C. You must not eat or drink in this area.**

Feel free to adjust based on any additional context you may have!