①那一声声沉稳而有规律的跳动，给我极大的震撼。

震撼：____

②一定要珍惜生命，决不让它白白流失。

白白：____

（Ⅰ）证明：展开式中没有常数项；

（Ⅱ）求展开式中所有有理项．

补全对话

A:Hello, may I speak to Kate, please?

B:Speaking.

A:Hello, Kate! This is Lily speaking. It's Sunday tomorrow. ____

B:Nothing much. Do you have any ideas?

A:The spring has come. I hear many flowers in park bloom together. It must be very beautiful.____?

B:Good idea. My sister Lucy also likes flowers very much. Let's invite her to come with us.

A:Why not? ____. Sa we can take some wonderful photos.

B:Great. I like taking pictures. ____ ?

A:Let's meet outside the school gate at half past nine in the morning.

B:How shall we go there?

A:Let's go there by bike.

B:Oh, my bike is broken. ____?

A:All right. See you!

B:See you!

如图所示，轻杆的一端有一个小球，另一端有光滑的固定轴O．现给球一初速度，使球和杆一起绕O轴在竖直面内转动，不计空气阻力，用F表示球到达最高点时杆对小球的作用力，则F（   ）