A: Hello,Lily. ____?

B: I' m going to have a party for my 14th birthday this weekend.

A: Oh, that's wonderful! ____?

B: I will have it at home. ____? I'll be happy if you can come.

A: Sure, I'd love to. And I'll bring some cakes made by my mom. She's good at baking (烘焙), you know.

B: Thanks.

A: ____ ?

B: It will start at 10 o'clock on Saturday morning. After that, how about going to the park?

A: ____! We can fly a kite there.

B: OK. See you then.

____＋18=44

44-18=____

如图，在水平地面点A处有一网球发射器向空中发射网球，网球飞行路线是一条抛物线，在地面上落点为B，有人在直线AB上点C（靠点B一侧）竖直向上摆放若干个无盖的圆柱形桶．试图让网球落入桶内，已知AB=4米，AC=3米，网球飞行最大高度OM=5米，圆柱形桶的直径为0.5米，高为0.3米（网球的体积和圆柱形桶的厚度忽略不计）．当竖直摆放圆柱形桶至少____ 个时，网球可以落入桶内．