Private Sub Command1_Click()

    Dim Pi As Single, t As Single

    Dim n As Integer, s As Integer

    Pi = 0

    t = 1: n = 1: s =1

    Do While Abs(t) >= 0.0001

        Pi = Pi + t

        n ={#blank#}1{#/blank#}

        s= {#blank#}2{#/blank#}

        t = s / n

    Loop

    Text2.Text ={#blank#}3{#/blank#}

End Sub

为实现上述功能的程序如下，请在程序划线处填入合适的代码。

Private Sub Command1_Click()

    Dim a As String

    Dim n As Integer

    a = Text1.Text

    n = Len(a)

    Do While   ①    and Mid(a, n, 1)="0"

        n = n - 1

    Loop

    For i = n To 1 Step -1

        Text2.Text = Text2.text +     ②    

    Next i

End Sub

tmps = [32,28,26,29]

n = len (tmps) ; top = -1

an s = [0] * n

stk = [-1] * n

for i in range(n):

    t = tmps[i]

    while top > -1 and t > tmps[stk[top]] :

        d = stk[top]

        top -= 1

        an s[d] = i - d

        top += 1

        stk[top] = i

print(an s)

执行该程序段后，输出的结果是（   ）

请回答下列问题：

q=[""]*50

head=tail=0

s="ningbo'

for i in s:

    q[tail]=i

    tail+=1

while head<tail:

    print(q[head],end="")

    head+=1

    for i in range(3):

        q[tail]=q[head]

        head+=1

        tail+=1

执行该程序段后，输出结果为（   ）