排列句子。

①忽然，他看见一位小朋友摔倒了。

②把他扶起来，擦了擦小朋友身上的水。

③一个下雨天，路上很滑。

④王明打着雨伞，向学校走去。

⑤他立刻跑过去。 

⑥那位小朋友感激地说：“哥哥，你真好！”

水往低处流的原因是（   ）。

给出以下问题：

①求面积为1的正三角形的周长；

②求键盘所输入的三个数的算术平均数；

③求键盘所输入的两个数的最小数；

④求函数$f\left(x\right)=\left\{\begin{array}{c}2x,x\ge 3\\ x^2,x<3\end{array}\right.$当自变量取x₀时的函数值．

其中不需要用条件语句来描述算法的问题有____ ．

    The Americans were getting ready to send their first man to the moon, an old Irishman (爱尔兰人) was 1 them on TV in a hotel room. There was an Englishman in the room 2. And he said to the Irishman, “The Americans are very 3, aren't they? They are going to send some men to the moon. It's a very 4 way from our world.” “Oh, that's 5,”the Irishman answered quickly.” “The Irishman are going to send some men to the sun in months' 6. That's much 7away than the moon, you know. “The Englishman was very 8 when he heard this. “Oh, yes it is,” he said, “But the sun is too 9 for people to visit.”

    The Irishman laughed and answered, “Well, the Irish are clever, too, you know. We 10 go to the sun during the day, of course. We'll go there during the night.”