Read the text and then answer the questions.
Tomorrow is our big trip to the Sierra Nevada. Our teacher told us: "You must bring your original ID card, or you can’t board the bus. It is a strict rule. You should pack a warm jacket because the weather in the mountains is very unpredictable. If you have any questions, you may ask me now, but please be quick.
We are a bit nervous about the hike. Some students can walk for hours without getting tired, but others are worried. The guide said that it could be a sunny day, but there is a small chance of rain. Also, he mentioned that we might see some rare birds if we are very quiet, although they usually hide from people. Remember, you should drink plenty of water during the walk to feel good."