根据句意及汉语提示，填写单词。

1. My sister likes soft colors, such as white and _____(粉红色).

2. You shouldn’t treat him like that. I don’t think it’s _____ (公平的) to him.

3.She said that loud music made her _____ (紧张的).

4. We feel uncomfortable to sit on _____ (硬的) seats.

5. They made the school a place for _____ (科学的) experiments.

在窗体上画一个名称为C1的命令按钮，然后编写如下事件过程：

Private Sub C1_Click()

a=0

n=Input Box("")

For i=1 To n

For j=1 To i

a=a+1

Next j

Next i

Print a

End Sub

程序运行后，单击命令按钮，如果输入4，则在窗体上显示的内容是( )。

A．5

B．6

C．9

D．10