关于校园的英语情景对话（同学与同学之间），两分钟的口头对话。急~~

Scene：Classroom in the school

Lina said out loud：The first is easier, is to calculate the question, please think
Two 10 and two 4, addition, subtraction, how to arrange to make the final result is equal to24?

Joanna：I have to answer, Lina。Very simple. 100 by 10 equals 10, minus 4 divided by 4 is equal to 96,96 to be 24.

Lina：A good next question。The same pool as the pearl necklace of five arranged in a circle, usually billiards were all written numbers. Now several of these five can be selected billiards, but can only choose the number of consecutive, one, two, or five can be, in short, numbers can not be interrupted. How to choose, only so that the five numbers on the ball after the results obtained in the calculation can be found in any number of 1 to 21?