【答案解析】Dear Sam, I am glad to receive your letter. As for your questions, I would like to recommend the London school, for it offers a better nightlife, or else you might be bored. I believe studying for 15 hours a week suits us most because that allows us more time to visit around and know about this great country. Two weeks are definitely not enough for that and significant improvement of our English. You might have to leave before you even get familiar with the accommodated family who would provide considerable opportunities for practices of your English speaking ability. Besides, the excursions cost a lot ; the city tour might be more affordable and helpful. Wish you a good experience in Britain. 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Tom