${\left(1+x\right)}^n$展开式的二项式系数之和为64,则n的值为                   （    ） 

不同物体中传播声音的本领不同，声音不能在____中传播。

补全对话。

Ann: What are you going to do this afternoon?

Ken: I'm going to buy some DVDs about Quanzhou Maritime Silk Road.

Ann:____ Why not go to the Film Fans' Room?

Ken: The Film Fans' Room? ____

Ann: It is a place where students can exchange their DVDs with others. I think you can get what you want there.

Ken: ____How can I get there?

Ann: It's next to Donghu Cinema. You can take the No. 13 bus.

Ken: OK. ____

Ann: There is one just outside Huaqiao University. You can get on the bus there.

Ken: Thank you very much.

Ann: ____

带“春”字表现春天的：____，____。《早春呈水部张十八员外》