Based on the provided passage, here are the answers to the questions:

**Question 29. How many languages can the writer speak?**
**Answer:** C. 3 (The writer can speak French, Spanish, and is still learning another language.)

**Question 30. The writer has learnt Spanish __________**
**Answer:** C. at university (The passage states that the writer is studying Spanish at the university.)

**Question 31. Travelling may cause troubles if __________**
**Answer:** A. you cannot speak the language well enough. (The passage implies that not being able to speak the language can lead to troubles.)

**Question 32. The most important thing is __________**
**Answer:** A. mastering grammar and vocabulary (The passage indicates that grammar and vocabulary must be mastered.)