阅读理解 . Hello, everyone, Here is something important for everyone going to London next month. As you know, you are going to stay with a family for two weeks. Now, the most important thing is money. You should take about 530 dollars with you. I think it will be enough for everyone. Then, when you arrive, your new family will meet you. You must remember to wear a red shirt, so the family will find you easily. They've been told you all wear red shirts. You'll also need to take with you 4 photos of yourself and, it's also very important that you take the school letter. While you're there, if you have any problems, you can call Leech School Office. I'll give you the office phone number: it's 580-4436 and the per-son to ask for is Mrs Becher she is in the office from nine o'clock in the morning until five in the afternoon every day. OK. That's everything. Have a good journey! 根据短文内容，回答下列问题。 1. Where are they going? 2. How long are they going to stay there? 3. Why must they wear red shirts? 4. What could Mrs Becher's job be according to the passage?