Make sure you book tickets __________ because it costs more at the airport!

Sample answer:

When learning English, I find listening the most challenging, and I have done several things to improve it. Firstly, I watch English movies and TV shows, which helps me get used to different accents, such as British English and American English. Secondly, I listen to online videos, including interviews and TED Talks. These videos help me hear how native speakers communicate in real-life situations. I can also adjust the speed of the video to match my level and replay parts I don’t fully understand. Finally, I speak English with my friends or native speakers whenever I can. Engaging in conversations allows me to practice listening and responding in real time. These are three things I have done to improve my listening skills.