下边是几组作者或作品，从文学知识的角度看，该组中有一个与其他三个不同类，把它选出来（ ）

” is regarded by many people as a time in theirlife _____ fun, passion, and imagination seem limitless

there a ____ to the time that I canstay here — Yes, you must leave here before he comesback

The little girl who got lost decided to stay _______ she was and wait for her mother.

Was it in Shanghai, where the World Expo 2010 was held ______ you met Helen?—Yes. We hadn’t seen each other for about 5 years.