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——Last month I traveled across the Sahara Desert by ______ camel with some locals.               
——What ________ amazing experience!

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—Are you ready to leave, Helen?     
—_________
—I was just asking if you're ready to leave.

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“山东大势一去，就是破坏中国的领土!……所以我们学界排队到各公使馆去要求各国出来维护公理，务望全国工商界，一律起来设法开国民大会……中国存亡，就在此一举了!”与该宣言相关的历史事件是（     ）

4.Dear Grace,
    How are you? Thank you for your last e-mail. You want to know about my school clubs, right ? Well, it's time for us to join the school clubs now. There are many clubs in my school, like the English club, the art club, the music club and the sports club. I have two good friends, Jack and Lisa. We all want to join the school clubs.
    I want to join the music club, because I can play the guitar. I can't speak English well, but I also want to join the English club.
Jack likes sports. He can play soccer and basketball. He is in the school soccer team(队). He wants to join the sports club. He can play the guitar, too. But he doesn't want to join the music club.
    Lisa likes drawing. She wants to join the art club. She also speaks English very well. I think she can be in the English club. But she can't be in the music club. She can't play any instruments(乐器).
    Are there any clubs in your school? What club are you in? Please write an e—mail and tell me about your school clubs.
Yours,
Jane

5.设集合，，则集合的子集的个数为  

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