补全对话，每空一词

J=Jenny  E= Emily    

J: Hello, Emily. Long time no see. Where did you go on  1  ？    

E:I went to London  2  my parents.    

J: Really? What do you think of London?    

E: It's a beautiful  3  .I like it very much.    

J：How was the  4   there?    

E: Oh, it  5   rainy or cloudy those days.    

J: Did you visit the Big Ben?    

E:Yes. I also went to a middle   6  .    

J: What about the  7   in that school?    

E:They are strict. Students there can't wear jeans  8     shirts. They have to wear  9   at school.    

J: We have to wear uniforms, too. Anything else?    

E: Let's talk  10   them later.

患儿，女性，10岁1个月，主诉上中切牙牙间萌出时就有间隙，至今未闭合。临床检查时可见之间间隙约4mm，X线片显示之间有一个埋伏多生牙。

间隙关闭后应采取的措施比较合适的是（）

A.无需保持

B.终身保持

C.固定保持器保持至上颌尖牙萌出

D.活动保持器保持至18岁

E.以上都不是